Name: Star Oilco
Address: 232 NE Middlefield Rd., Portland, OR, 97211, United States
Telephone: 503-283-1256
Price range: $$

Star Oilco truck fueling a large generator during winter conditions

July 17, 2026

Diesel Backup Tanks – Treating and Refilling https://staroilco.net/wp-content/uploads/2021/11/37-what-do-I-need-to-know-about-long-term-diesel-storage-1024x768.jpeg 1024 768 Star Oilco Star Oilco //staroilco.net/wp-content/uploads/2022/10/StarOilco-Logo-RGB-C-Lg-Simple.png July 17, 2026 July 17, 2026

Diesel Backup Tanks – Treating and Refilling

Here’s good advice if you are relying on diesel as a back up fuel in the Pacific NW.

Now is the time to refill and treat your back up fuel tanks.

Diesel as a back up fuel

Quite a bit of our business at Star Oilco is fueling back-up generators, emergency water pumps, refrigerated trailers and other long term off-road diesel storage requirements. In the Pacific Northwest, biodiesel blending is required by state laws and you need to take an extra duty of care when storing diesel as a back-up fuel.

This means that most off-road diesels and heating oils are ultra low sulfur diesel containing a small quantity of biodiesel. That means long term storage requires a proactive approach. You can’t just hope and wait to see what the fuel begins to look after years of storage.

Technical advice from Government Fleet Magazine to help you with storing diesel fuel.

Here is an article from Government Fleet Magazine on the subject which runs through the specifics of long term storage and what causes fuel to degrade when stored. Government Fleet Magazine – How to Maintain Stored Diesel Fuel.

Star Oilco has also worked up a PDF check list on how to verify if your fuel is in need of freshening or is still in emergency ready shape. If you are a customer of ours, we will deliver a laminated card version to keep next to your back up generator. If you are not a customer (or outside of our service area) drop us a message below and we will gladly email you the PDF.

For our customers, we recommend that you check the tank bottom fuel quality on an annual basis to make sure the product looks good. If the tank has sat for years and is dark in color (good diesel is bright and transparent – you will notice if it is in bad shape), we recommend pumping the tank out at least partially and replacing with fresh fuel. Often you can also hugely improve the quality of the fuel by polishing the fuel. Polishing is when you circulate fuel from the bottom of the tank through a pump, filter repeatedly in order to remove any sediment or growth from the fuel, and then place this fuel back in the same tank.

Look at your fuel for a bright and clear color.

For stored fuel, you also want to make sure it is stabilized and contains a biocide. Stabilizers prevent the oxidation of the fuel and prevent the effect of metals like lead, copper and zinc, which can react and degrade fuel. For heating oil systems with a return line, for instance, the fuel is flowing through a copper line to the furnace and then back to the tank in a return line.

Use additives designed to prolong the life of your emergency diesel fuel.

Biocides prevent the growth of biological activity in the tank. In scenarios where micro-organisms like algae, bacteria, yeasts, and other bugs are growing in your fuel, biocides can kill this growth. It is still important to remove the residual grit and other contaminants that are the hallmark of bugs growing in your tank. Usually you remove them by filtration or total turn over of the fuel. If your tank absolutely has to be clean, you can contract a tank professional to enter the tank and physically clean the tank bottom or reline the tank with either fiberglass or an epoxy resin.

Water in diesel destroys fuel quality rapidly. Check your tank for water every fall and spring.

In events where water finds its way into your storage tank, that can also be corrected by pumping the tank bottom. Additionally, you want to put in an absorbent material designed to absorb water and not fuel. If your long term storage tank has water and you are not planning to burn 100% of the fuel in the near future, DO NOT add anything that removes water by distributing into the fuel. Adding a “fuel drier” that actually pushes the water into solution with the diesel will worsen the long term quality of your fuel, not improve it. That water is where bugs find their home to grow in fuel.

Star Oilco will test your fuel at no charge if you have an open account.

Feel free to call us with any questions you may have about long term storage of diesel. Star Oil can also deliver treated diesel ready for long term storage complete with Hydrotex PowerKleen Premium Diesel additive to improve the long term storage quality of your fuel. For biocide, we use Valvtect BioGuard fuel microbiocide to kill any possible biological activity and prevent any chance of it starting.

If you have a long term diesel storage tank and you are in the Portland, Oregon area, we are here to test your fuel. Make sure your diesel is there for you when disaster strikes.

Tank Testing Form

For more reading on diesel fuel quality assurance:

Fight Humbug in your Diesel Tank (using Valvtect Bioguard Plus 6 to stabalize your stored diesel)

Diesel Fuel Technical Review (an easy to read and free text book on diesel fuel)

Emergency Back Up Generator Fuel Quality (designed to provide a checklist to help Facility Managers keep those back up generators ready for emergency action)

Using Desicant Breathers to keep diesel fuel dry and clean (an introductory primer on desicant breathers and how they can be used to keep long term diesel storage drier and cleaner)

Using Diesel Filters to clean up your diesel fuel quality (an introductory primer on using aggressive filtration in line with diesel fuel dispensing for fuel quality assurance)

Bio-diesel and Feed-stock samples at REG

July 17, 2026

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What Types of Feedstock Can Be Used To Make Biodiesel?

What Types Of Feedstock Can Be Used To Make Biodiesel?

To answer what feedstocks can be used to make biodiesel we need to first answer: What is Biodiesel?

Biodiesel is created through a process called transesterification. Transecterification is when an alcohol such as methanol or ethanol is added to an oil or fat. This creates methyl esters and glycerin. Methyl esters is the scientific name of Biodiesel. Because biodiesel needs a fat or an oil to start with, this fuel can can be created with any number of feedstocks. If you would like to learn more about Biodiesel check out this for more questions about biodiesel.

According to the U.S. Office of Energy Efficiency & Renewable Energy:

“A feedstock is defined as any renewable, biological material that can be used directly as a fuel, or converted to another form of fuel or energy product. Biomass feedstocks are the plant and algal materials used to derive fuels like ethanol, butanol, biodiesel, and other hydrocarbon fuels. Examples of biomass feedstocks include corn starch, sugarcane juice, crop residues such as corn stover and sugarcane bagasse, purpose-grown grass crops, and woody plants. “

Renewable Energy Group (REG) performed a study in 2009 with the support of the Iowa Power Fund Board and the Iowa Office of Energy Independence that tested 36 individual feed-stocks. Star Oilco will be spotlighting these feedstocks through our blog and our social media. The full report can be found on their site if you would like to read ahead or explore the results in more depth. We hope you find these as interesting as we did!

Above photo taken at REG headquarters in Ames, Iowa.

This first blog highlights the following 2 types of feed-stock:

Babussa Oil & Beef Tallow

Babassu Oil

Babassu oil is extracted from the seeds of the babassu palm tree, Attalea speciosa, an evergreen tree growing to 30 m (98ft) by 20 m (65ft) at a slow rate. It is hardy to zone (UK) 10 and is not frost tender. The flowers are pollinated by bees and other insects. The tree is common in Brazil, Mexico, and Honduras; it grows well in areas typically cultivated for coconut or palm. The kernels contain 60-70% oil, appear transparent, and smell like walnuts. In its natural form the oil is liquid at 20-30°C (68 – 86°F). The seeds are edible and the oil is used in margarine, soaps, detergents, lamp oil and skin products. Oil extraction results in a cake containing 15-25% protein (depending on the shell content), which is a valuable feedstuff.

In February 2008, Babassu palm oil and coconut oil were blended with jet fuel to power a Virgin Atlantic Boeing 747 during a test flight from London’s Heathrow to Amsterdam.

Beef Tallow

Tallow is a rendered form of the waste fats and greases from processing beef. Rendering is a process by which lipid material is separated from meat tissue and water under heat and pressure. Beef tallow is primarily made up of triglycerides and it is solid at room temperature. The B100 that is created from this source has a very high cloud point. “Cloud point is the temperature at which wax (paraffin) begins to separate when oil chilled to a low temperature, and it serves as an important indicator of practical performance in automotive applications in low temperatures.” (Source) The other uses for tallow include animal feed, soap, cooking and in the past, candles.

Article 2 Feedstock : Borage Oil & Camelina Oil

Article 3 Feedstock : Algae Oil & Canola Oil.

Article 4 Feedstock : Castor Oil and Choice White Grease

Article 5 Feedstock : Coconut Oil and Coffee Oil

Article 6 Feedstock : Evening Primrose Oil and Fish Oil

Article 7 Feedstocks : Hemp Oil & High IV and Low IV Hepar

Article 8 Feedstocks : Jatropha Oil, Jojoba Oil, & Karania Oil

Article 9 Feedstocks : Lesquerella Oil & Linseed Oil

Article 10 Feedstocks – Moringa Oil & Neem Oil

Article 11 Feedstocks – Palm Oil & Perilla Seed Oil

Article 12 Feedstocks – Poultry Fat & Rice Bran Oil

Article 13 Feedstocks – Soybean Oil & Stillingia Oil

Article 14 Feedstocks – Sunflower Oil & Tung Oil

Map of the United States showing 65,000 Pacific Pride cardlock locations with fuel card in foreground

July 10, 2026

Use Pacific Pride Cardlock to Fuel your Portland, Oregon Fleet https://staroilco.net/wp-content/uploads/2018/08/81-pacific-pride-cardlock-fueling-in-portland-oregon-1024x593.png 1024 593 Star Oilco Star Oilco //staroilco.net/wp-content/uploads/2022/10/StarOilco-Logo-RGB-C-Lg-Simple.png July 10, 2026 July 10, 2026

Use Pacific Pride Cardlock to Fuel your Portland, Oregon Fleet

Seize Control of Your Fuel Spending with Pacific Pride Cardlock

A Pacific Pride Cardlock Card gives you the ultimate control over when and where fuel is purchased. Plus, we guarantee the highest level of control by offering human support to make it easy for a small business. You have enough to manage and don’t need another website to log into! Know who bought what, when, and where — in real time — to better manage the buying decisions by your drivers.

Pacific Pride, CFN, WEX, Voyager and other fleet cards all have similar tools. But with Pacific Pride Cardlock, you’ll benefit from stand alone commercial fuel sites that are available 24 hours a day, 7 days a week, 365 days a year.

In Oregon, the minimum wage is rising and that means the retail price of fuel is rising to pay for those wages. While other cards require you to wait in line and pay someone to fuel your vehicle in Oregon, Pacific Pride stand alone cardlock locations avoid that needless labor and allow your business to serve itself around the clock. Get out of fuel lines and save on your total cost of fuel.

Beyond the time and money savings of avoiding retail fuel lines, Pacific Pride cardlock also is far more secure to protect you from someone stealing fuel with your fleet card. Star Oilco’s Pacific Pride cardlock offering has a single simple tool for you: a human being on the other side helping make sure the total program is working. We help you grab control of every drop, dollar and driver.

We are your partner in Fleet Card and Cardlock Card success.

Star Oilco goes one step further than our competitors by keeping things simple and easy for you. This is done with the obvious human element and best practices that complete the full value that a secured fuel card offers.

Call us and have us take care of that for you. You tell us what you want, we’ll consult with you and you’ll get a working card program.

This is what we recommend for your non-management cards:

Secure your fleet card to a vehicle (attached to the license plate on the bill or place the fleet card on the key ring of the vehicle).
Designate your vehicle cards to only work in the state’s zip codes that you service during the times of day you operate as a business.
Give each driver a unique and secret PIN attached to their name (so when they use a card, their name appears on the bill next to the transaction).
Implement a “No Tolerance Fuel Theft Policy” with your Human Resource policy. Have every employee sign a contract with your business that they own their personal secret PIN and it is only for them to use. Star Oilco can provide a recommended policy for you to use. Then, if they share their PIN with someone else, they will be responsible for anything that happens. If theft is happening, it is a “No Tolerance” dismissal offense on the first occurrence.
Use the e-receipts to see in real-time fuel purchases. An electronic receipt is emailed to your Controller or Dispatcher to watch for off-policy fuel usage in real time, which allows your Dispatch or Management to respond the same day to questionable decisions around fuel cards.

Imagine how this works for your business in practice

You can set up restrictions by days of the week, hours of the day or even by zip codes. If your business does not operate on weekends, turn off the fuel cards during the times you do not operate. If your fleet is never on the road before 7am and is back at home by 7pm every night, set up those time restrictions to make it that much harder for fuel theft to occur. If you need to update this, change something, order cards, etc., just call our office and we take care of that update for you.

With our e-receipts, your Dispatch will get an email every time fuel is purchased. You will see where, what, when and with whom this occurs. You can reinforce your company fuel policies at the local level the same day — No more waiting for the bill to see if a driver did something that cost you money. By seizing control of your fuel, your drivers will also respond to your new level of control as well. By having control and transparency of what your drivers do, they will require less management as they know you are watching.

Often the most controllable expense related with fuel is the fuel that might slip through a business due to unethical employees or outside theft. Fuel slippage is the industry term for unauthorized fuel taking. With Pacific Pride cardlock fuel, you can take control over fuel purchases and avoid the loss up front with card controls. Contact Star Oilco for a total fuel security solution for your business.

Seize control with Star Oilco’s corporate fleet card solutions.

If you have further questions about Pacific Pride and control of your fleet fueling, call us at 503-283-1256 or contact us using the form below.

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Star Oilco is a proud Independent Franchisee of Pacific Pride

home insulation representing energy efficiency for renewable fuel standard compliance in Portland Oregon

June 18, 2026

Portland Renewable Fuel Standard Explained https://staroilco.net/wp-content/uploads/2024/07/zack-spear-ZB_Ns0hVZNk-unsplash-1024x683.jpg 1024 683 Star Oilco Star Oilco //staroilco.net/wp-content/uploads/2022/10/StarOilco-Logo-RGB-C-Lg-Simple.png June 18, 2026 June 18, 2026

Portland Renewable Fuel Standard Explained

Did you hear about the time Portland banned fossil fuel diesel?

Portland is making a big move to provide cleaner air and reduce greenhouse gas emissions. Portland has implemented what’s called the Renewable Fuel Standard (RFS) beginning its first phase on May 15th, 2024. The RFS policy in Portland mandates that there has to be an increase of use of low-carbon biofuels in diesel within city limits of Portland. This is part of the ultimate Climate Emergency plan. This RFS mandate was first implemented in 2006 as a B5 (5%) Biodiesel blend mandate with the goal of mandating a 20% blend. The RFS is the first of its kind not only in Oregon but in the entire United States. Portland’s reputation as a leader in environmental sustainability efforts continues.

Portland’s Phases To Implement Almost 100% Renewable Diesel

What makes Portland’s mandate unique is the requirement that the biofuels have a CO2 value so low it bars most American made biodiesels. The blending requirement starts at 15% in 2024, and then it will steadily increase to 50% by 2026 and will reach 99% by 2030. This schedule demonstrates how Portland’s low-carbon ambition is present to transition away from fossil fuels and promote alternative energy sources.

This policy is expected to reduce air pollution and carbon emissions. It will also create new markets for biofuels, which will lead to increased economic opportunities. This will ultimately help the city become a more sustainable and environmentally friendly place to live as Portland has taken the lead in striving for sustainability over the years.

The policy will also help create jobs in the biofuel industry and provide opportunities for businesses to switch to renewable energy sources. It will also help reduce the city’s dependence on fossil fuels and protect the environment for future generations.

Want to learn more about meeting Portland’s requirements for the Renewable Fuel Standard mandate?

landscape view of Mount Hood representing Star Oilco’s fuel delivery service area in Oregon

Focus on Lower-Emission Biofuels

Uniquely, Portland’s RFS goes beyond just the biofuel blend. It also sets a strict carbon intensity (CI) standard for the biofuels themselves. This ensures the biodiesels used have a significantly lower carbon footprint compared to traditional options. Biodiesels produced domestically often fall short of this CI requirement, prompting many suppliers to look to renewable diesel sources. This focus on biofuels with a lower lifecycle carbon footprint makes Portland’s RFS even more impactful in reducing greenhouse gas emissions.

Iconic Portland sign on Broadway at dusk with city buildings in the background

Exemptions and Implementation Details

The initial phase of the RFS targets on-road diesel sales. This applies to diesel purchased at gas stations, by mobile fueling companies, and for use in large stationary tanks. However, the long-term goal includes all diesel use within the city. Some temporary exemptions apply to off-road diesel uses such as heating oil, generator fuel, aircraft fuels, watercraft fuels, and other dyed fuel users. One local truck stop, Jubitz Truckstop, was granted a temporary exemption. This is likely due to concerns about disrupting critical transportation operations. Daimler (the manufacturer of Freightliner and Western Star trucks) has a research facility in Portland. Daimler was also granted an exemption to meet their specific fuel needs for testing purposes.

The RFS enforces compliance through fuel sampling and requires documentation proving the fuel meets the minimum biofuel content and CI standards. Businesses that purchase diesel need to be able to show their compliance through bills of lading (BOLs) or similar records from their fuel provider, like Star Oilco. If a business does not comply and provide this documentation, it can result in pretty hefty fines. First offenses can be a fine of $10,000 per day. Repeat offenders will end up facing even bigger penalties of up to $15,000 per day. These fines can really show the impact of how serious Portland is taking this initiative.

Impact on Businesses and Consumers

While residential consumers who don’t purchase diesel directly are not directly impacted, businesses purchasing diesel, especially in bulk, will need to adapt to the new regulations. This may involve acquiring documentation from fuel suppliers or entering into contracts guaranteeing compliant fuel blends. Wholesale fuel distributors, who sometimes purchase from multiple vendors and blend fuel mid-route, may face additional challenges in tracking the biofuel content and CI of their product. However, as the program matures, the industry is expected to adapt and streamline these compliance procedures.

Contact Us Today To Discuss What This Means For Your Business

A Step Forward for Cleaner Transportation

Portland’s ambitious RFS sets a new expectation for sustainable transportation. Promoting low-carbon biofuels allows Portland to aim to significantly reduce its reliance on fossil fuels and be able to contribute to cleaner air for its residents. The RFS program will be able to serve as a model for other cities that are looking at implementing similar initiatives. Great job Portland for paving the way to a sustainable future for other cities! Although challenges will remain, as businesses adapt to this new norm, Portland’s RFS represents a significant step forward in creating a more sustainable transportation sector.

The RFS program is an important step in the fight towards sustainability and lower carbon fuels. It sends a clear message that cities are willing to take action to reduce emissions and protect the environment. We anticipate that other cities will follow Portland’s lead and create similar initiatives. This will have a significant impact in reducing emissions and helping to protect the environment.

It is a positive step towards a more sustainable future. Alternative fuels have become more and more readily available. Investing in alternative fuels and reducing carbon emissions is essential for protecting the planet for future generations. Governments should prioritize investing in renewable energy sources and incentivize communities to switch to alternative fuel solutions.

Thank you for choosing Star Oilco as your preferred fuel provider in Portland and Vancouver, Washington. Give us a call to discuss how the RFS mandate can affect your business and one of our team members would be happy to discuss this with you.

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Golden diesel fuel swirling in abstract motion

June 18, 2026

Star Oilco Diesel Fuel Quality Assurance https://staroilco.net/wp-content/uploads/2016/05/proof-precision-fuel-management-program-works-star-oilco-1024x574.jpg 1024 574 Star Oilco Star Oilco //staroilco.net/wp-content/uploads/2022/10/StarOilco-Logo-RGB-C-Lg-Simple.png June 18, 2026 June 18, 2026

Star Oilco Diesel Fuel Quality Assurance

Diesel Fuel Is Often A Company’s Largest Expense. Unfortunately, there is very little control over its quality.
Fuel Quality Has Declined over the last 25 years…

Engine manufacturers have tightened the tolerances for fuel

Newer tier 4 engines starting from 2008 need cleaner fuel

“Over the last two decades, the cetane number and the API gravity, the basic measures of crude oil quality have declined.”

—Society of Automotive Engineers, (SAE) Bulletin 872243

Cetane number is actually a measure of a fuel’s ignition delay. This is the time period between the start of injection and start of combustion (ignition) of the fuel. In a particular diesel engine, higher cetane fuels will have shorter ignition delay periods than lower cetane fuels.

What is a typical API gravity for diesel fuel? The classic book “Petroleum Refinery Engineering” by W.L. Nelson (4th ed., McGraw-Hill, 1958) gives numbers ranging from about 25 to 40 (with “Grade 1-D” around 40 and “Grade 2-D” around 35). In a Web search using the keywords “diesel” and “API gravity” I found a couple of sites with specs for #2 diesel fuel; these had minimum values of 26 and 30 API gravity. So a reasonable guess would be that typical #2 diesel fuel would have an API gravity of about 35; I’ll let you plug that into the above formula to get the specific gravity.

The densities of petroleum products are traditionally (especially in the U.S.) expressed as “API Gravity” The API Gravity is related to the specific gravity by the equation: API = (141.5/SPGR) – 131.5, where the specific gravity is the density relative to that of water and everything is measured at a temperature of 60 degrees F.

“Diesel fuel quality has deteriorated for the past 20 years and is expected to continue this trend for the foreseeable future.”

American Society for Testing and Materials, (ASTM) Pub. # 10056

COMMON PROBLEMS WITH 21st CENTURY DIESEL FUEL IN THE PACIFIC NW

The odds are stacked against the fleet owners

what can be done to help alleviate or control the problems?

you have questions, we have the solutions, call us to find out.

If you have bulk fuel storage, the first step is testing your tank bottom and what is coming out of the nozzle. Star Oilco can do a complementary ASTM and ISO specification analysis of your diesel fuel. If you are seeing recurring fuel system issue, the first step is to make sure your bulk storage isn’t the problem. We can help.

Tank Testing Form

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June 17, 2026

Diesel Exhaust Fluid (DEF) Quality, Storage, and Future Considerations https://staroilco.net/wp-content/uploads/2025/07/1-1024x1024.png 1024 1024 Star Oilco Star Oilco //staroilco.net/wp-content/uploads/2022/10/StarOilco-Logo-RGB-C-Lg-Simple.png June 17, 2026 June 17, 2026

Diesel Exhaust Fluid (DEF) Quality, Storage, and Future Considerations

Have you ever noticed that Diesel Exhaust Fluid (DEF) often lives in the background until suddenly it’s the reason your fleet can’t meet emissions standards or a system clogs up? DEF quality and storage isn’t just technical noise, it’s vital for keeping your SCR system happy and your operations rolling smoothly. We want to share with you what makes DEF high quality, the best ways to store it, and what trends are shaping its role in diesel emissions systems moving forward.

Diesel Exhaust Fluid (DEF) is a crucial component in modern diesel engines equipped with Selective Catalytic Reduction (SCR) systems. While many fleet operators are familiar with its basic function of reducing nitrogen oxide (NOx) emissions, understanding the intricacies of DEF quality, storage, supply chain considerations, and system maintenance can help businesses optimize efficiency and avoid costly repairs. At Star Oilco, we provide fleets with the knowledge and resources needed to navigate these complexities. This guide will explore the advanced aspects of DEF, from maintaining quality and ensuring proper storage to understanding emerging trends in emissions technology.

Understanding DEF Quality and Purity

The quality of DEF plays a significant role in the performance and longevity of an SCR system. DEF must adhere to ISO 22241 standards, which regulate its composition, concentration, and purity. Using non-compliant DEF can lead to injector clogging, crystallization, and system failures. Even small amounts of contaminants such as dirt, fuel, or water can negatively impact DEF performance and damage expensive SCR components.

To ensure DEF meets the necessary standards, regular testing should be performed. Refractometers can measure the urea concentration to verify the correct 32.5 percent solution. DEF testing strips can detect impurities, while more advanced lab analysis can help diagnose performance issues related to fluid quality. Purchasing DEF from a reliable, ISO-certified supplier is the best way to avoid contamination and maintain compliance.

DEF Storage Best Practices to Prevent Contamination

Proper storage is essential for maintaining DEF integrity. Temperature control is a key factor, as DEF should be stored between 12 and 86 degrees Fahrenheit to prevent degradation. Freezing does not damage DEF, but extreme heat can cause evaporation and reduce its effectiveness. To minimize exposure to environmental factors, DEF should be stored in opaque, UV-resistant containers to prevent sunlight from breaking down its chemical properties.

Choosing the right storage material is also critical. DEF should be kept in plastic or stainless steel containers, as certain metals such as aluminum, copper, and zinc react with DEF, leading to contamination. Additionally, keeping storage containers sealed will prevent air exposure, which can introduce dust or debris. Managing inventory efficiently is another important aspect of storage. DEF typically has a shelf life of 12 months, but in warmer climates, its lifespan may be reduced to six months. Using a first-in, first-out (FIFO) inventory approach ensures that older stock is used before it degrades.

Regular inspections and cleaning of storage equipment are also recommended to maintain DEF purity. Be sure to check for residue buildup, leaks, or any signs of contamination in tanks, nozzles, and dispensing systems. Training staff on proper handling procedures can further reduce the risk of accidental contamination. By taking these proactive steps, you can ensure your DEF stays clean, effective, and ready to support emissions compliance.

DEF dispensing station pump showing control panel, hose, and DEF push button

How Temperature Affects DEF Performance

Temperature fluctuations can significantly impact DEF performance. In cold climates, DEF freezes at 12 degrees Fahrenheit, causing operational challenges for fleets. While frozen DEF does not degrade, it must be properly thawed before use. Heated DEF dispensers and insulated storage solutions can help prevent freezing issues in extreme weather conditions. It is important to avoid adding water to thaw frozen DEF, as this disrupts the precise urea concentration and compromises its effectiveness.

On the other end of the spectrum, high temperatures can cause DEF to degrade. Exposure to prolonged heat above 86 degrees Fahrenheit can lead to evaporation and an increase in urea concentration, which may result in improper dosing and SCR malfunctions. Storing DEF in shaded or climate-controlled areas can help mitigate heat-related degradation. Seasonal changes also impact DEF consumption rates, with colder temperatures often leading to increased DEF usage as SCR systems adjust to lower combustion efficiencies.

DEF Supply Chain Considerations

DEF relies on a stable global urea supply, making it susceptible to market fluctuations. Since urea is also used in fertilizer production, shifts in agricultural demand, export restrictions, and production slowdowns can lead to price increases and supply shortages. In times of high demand, fleets may struggle to secure sufficient DEF, leading to increased costs and operational challenges.

To avoid supply disruptions, fleet operators should consider strategic sourcing options. Establishing relationships with reliable DEF suppliers and securing bulk deliveries can help mitigate the risk of shortages. On-site DEF storage solutions can also provide a buffer against market volatility, allowing businesses to maintain an adequate supply without relying on just-in-time purchasing. Planning ahead for seasonal or industry-wide fluctuations in DEF availability can help fleets remain operational without unexpected expenses.

The Economics of DEF for Fleet Operations

DEF consumption is directly tied to diesel fuel usage, with most fleets using approximately two to three percent DEF per gallon of diesel burned. Understanding this ratio allows businesses to budget accordingly and monitor costs. Optimizing fuel efficiency can also lead to lower DEF usage, as well-maintained engines operate more efficiently and require less NOx reduction.

Using high-quality DEF prevents costly maintenance issues. Non-compliant or contaminated DEF can cause injector clogging, pump failures, and SCR system malfunctions, resulting in expensive repairs and downtime. Some manufacturers void engine warranties if improper DEF is used, making it even more important to source DEF from a certified provider. Preventative maintenance and regular DEF quality testing can help fleets avoid hidden costs associated with poor-quality fluid.

DEF System Failures: Causes and Prevention

Common DEF system failures can be traced back to improper handling, storage, and contamination. Crystallization, for example, occurs when DEF is exposed to air and loses moisture, leaving behind solid urea deposits that can clog injectors and sensors. Contaminated DEF can lead to buildup in the SCR system, affecting performance and triggering warning lights that may lead to vehicle derating or shutdown.

Preventing DEF system failures requires proactive maintenance. Regularly flushing DEF tanks, inspecting nozzles for blockages, and ensuring proper storage conditions can help prevent these issues. Using ISO-certified DEF from a trusted supplier also reduces the risk of contamination. Scheduled maintenance checks and SCR system inspections allow fleet operators to address minor issues before they escalate into costly repairs.

The Future of DEF and Emissions Technology

As emissions regulations continue to evolve, the role of DEF in diesel technology is likely to expand. The Environmental Protection Agency (EPA) continues to push for stricter NOx reduction targets, which may lead to advancements in SCR systems and increased DEF usage. Some manufacturers are exploring alternative NOx-reduction methods, such as ammonia-based catalysts or hydrogen fuel cell technology, but DEF remains the most effective solution for modern diesel engines.

While DEF will remain a key component of emissions compliance for the foreseeable future, fleet operators should stay informed about regulatory changes and advancements in emissions technology. Investing in high-quality DEF and optimizing storage and usage practices will help businesses stay ahead of evolving environmental standards.

DEF Myths and Misconceptions

Several misconceptions about DEF persist, leading to improper use and maintenance practices. One common myth is that water can be added to DEF in emergencies. This is incorrect, as dilution disrupts the precise 32.5 percent urea concentration, rendering it ineffective and potentially damaging the SCR system.

Another common belief is that DEF improves fuel efficiency. While DEF itself does not enhance fuel economy, it allows for optimized engine performance by reducing backpressure in the exhaust system. This results in better combustion efficiency, which can lead to slight improvements in fuel usage.

A final misconception is that DEF does not expire. In reality, DEF has a shelf life and degrades over time, especially when exposed to heat or contaminants. Proper storage and inventory management are essential to maintaining DEF quality.

How Star Oilco Ensures High-Quality DEF for Customers

Star Oilco provides high-quality, ISO 22241-certified DEF to ensure fleets remain compliant and operational. Our bulk DEF delivery services allow businesses to secure a reliable supply, reducing the risk of shortages and minimizing costs. We also offer on-site DEF storage solutions to help fleets manage their inventory efficiently.

In addition to supplying high-quality DEF, we assist customers with DEF system maintenance, testing, and best practices to ensure long-term reliability. With our commitment to quality and service, Star Oilco is the trusted partner for businesses looking to optimize their DEF usage and reduce the risk of SCR system failures.

We also help customers stay up to date on regulatory changes and evolving DEF standards to ensure full compliance. Whether you’re a small fleet or a large operation, our team is ready to tailor a DEF solution that meets your specific needs.

For more information on our DEF solutions, contact Star Oilco today to learn how we can help keep your fleet running efficiently while meeting emissions compliance standards.

Frequently Asked Questions

What exactly does DEF do in my diesel engine?

DEF (Diesel Exhaust Fluid) is injected into the exhaust stream of modern diesel engines equipped with Selective Catalytic Reduction (SCR) systems. It reacts with exhaust gases to convert harmful nitrogen oxides (NOx) into harmless nitrogen and water vapor. This process dramatically cuts emissions, keeping your fleet compliant with strict EPA standards.

How long does DEF last in storage?

Stored properly, DEF generally has a shelf life of up to 12 months. However, exposure to heat can shorten this to 6 months or less, especially in warmer climates. That’s why using a first-in, first-out (FIFO) system is crucial. It ensures older DEF is used before it degrades, protecting your SCR systems from concentration issues that could cause costly repairs.

How much DEF does my fleet actually use?

Most fleets use about 2-3% DEF relative to diesel fuel burned. That means for every 100 gallons of diesel, you’ll consume roughly 2 to 3 gallons of DEF. Knowing this ratio helps you forecast DEF needs alongside your fuel budgets.

Does DEF improve my fuel economy?

Not directly. DEF doesn’t boost fuel economy on its own. However, by reducing exhaust backpressure through the SCR process, your engine can operate more efficiently, which may lead to slightly better combustion and fuel performance over time.

Can DEF expire even if it’s stored properly?

Yes. DEF naturally degrades over time, even under ideal conditions. Keeping it cool, sealed, and protected from UV rays slows this process, but eventually it ages out. That’s why FIFO inventory management and routine checks of DEF age are important to avoid using degraded product.

Why does DEF usage increase in colder weather?

Colder temperatures can make diesel engines burn less efficiently, leading the SCR system to dose more DEF to keep NOx emissions in check. This seasonal variance is normal, but it means winter months may see DEF usage spike slightly higher than your average.

How might future EPA emissions standards impact my DEF usage?

Regulations on NOx emissions are only getting tighter. This means future SCR systems could demand even more precise DEF dosing, or fleets might see an overall increase in DEF consumption. Staying committed to quality DEF, proper storage, and system maintenance now will help keep you ahead of regulatory curves and avoid penalties later.

How does Star Oilco help prevent costly DEF-related issues?

We supply only ISO-certified DEF, deliver it in bulk or packaged form, and provide on-site storage solutions to keep your operations protected. Our team also supports customers with DEF quality testing, maintenance guidance, and proactive system checks to help you avoid breakdowns, warranty headaches, and surprise costs.

comparison chart showing difference between off-road diesel and on-road diesel fuel in Portland OR

June 12, 2026

The Future of Diesel Fuel https://staroilco.net/wp-content/uploads/2024/06/Untitled-design-45.png 940 788 Star Oilco Star Oilco //staroilco.net/wp-content/uploads/2022/10/StarOilco-Logo-RGB-C-Lg-Simple.png June 12, 2026 June 12, 2026

The Future of Diesel Fuel

Retail Diesel Dispenser Example — Retail Diesel Pumps with a variety of blends of diesel. Biodiesel, Renewable Diesel, and Fossil Diesel blends shown in Portland, Oregon.

The Future of Diesel is Low CO2 Synthetic Fuels

The stew of molecules your diesel is made of has been changing. A next level technology in chemistry is enabling garbage to be transformed into hydrocarbon fuels like diesel, jet fuel, naphtha, and propane as well as other high value chemicals. These technologies enable petroleum refineries in the United States to retool themselves and move into making biofuels with the very technology used to refine modern gasoline and diesel fuels from crude oil. Currently oil refineries take crude petroleum and crack the molecules and reform them with a hydrotreater. This hydrogenation is what makes renewable diesel from fats, oils and greases.

If you have ever worked under your sink at home. Remember the greasy mess inside the pipes below your kitchen sink. These renewable hydrogenation technologies can turn that trash into a super clean high performance synthetic diesel fuel. That waste stream along with used deep fryer oil, the animal fats from rendering and other sources is the feedstock for renewable diesel. It is exciting and this will be the future of our diesel and jet fuels. These fuels also have a fraction of the CO2 footprint of a fossil fuel equivalent as measured by Oregon, Washington or California’s rules to measure the carbon intensity of fuels.

Diesel Fuel in Oregon and Washington

Star Oilco has been getting questions on the changes of diesel in Portland, Oregon. If you have not noticed, many diesel pumps at retail gas stations and cardlock have seen changing stickers on the face of the fuel pumps. As of July 1st, 2024 the City of Portland requires a minimum 15% biofuel content of all diesel sold. This policy is called the Portland Renewable Fuel Standard. Portland currently plans to ramp up this requirement to a 50% biofuel blend in May of 2026. So that every gallon of diesel sold inside the City of Portland must be half biomass based diesel products blended with fossil diesel.

This has caused quite a few changes in what fuel pumps have as their fuel for sale. Usually people notice this change with teh color of the diesel coming out of the retail nozzle. Diesel fuel buyers are noticing the bright yellow color of B20 biodiesel, the fully clear color of Renewable Diesel or a mix of several fuels tinting the color of their diesel. This trend is bigger than just Portland.

Today on the west coast there are a variety of product label stickers you will see on diesel pumps. These show the variety of diesel fuel specifications that are being sold to diesel vehicles today. Blends of petroleum ultra low sulfur diesel, R99 (99%) renewable diesel, and B99 (99%) Biodiesel are combined to meet the market needs of the diesel we all buy.

This change is because of a combination of pure market forces, government rules and local decisions by fuel haulers. Today’s diesel not only has a commodity market for the fuel it also has a market for CO2 credit value and a cap of total petroleum diesel fuel that can be sold into a west coast state with a “Cap and Invest” program requiring blends of low CO2 biofuels, the liquid fuels sold for vehicles.

Add on top of these market forces, advances in technology used to make the liquid diesel fuel. The diesel arriving at truck stops, gas stations, cardlock or out of a hose from a bulk truck has been changing and it’s often in good ways. Knowing how can be helpful in navigating why diesel may cost one price or another and may have a need or maintenance that another fuel does not.

THE RISE OF RENEWABLE DIESEL

Renewable diesel, also called R99 as in 99% renewable diesel, is a synthetic diesel fuel made from the same feedstock as biodiesel. The big difference though is that renewable diesel’s finished product is hydrocarbon diesel. Biodiesel chemically is not a hydrocarbon or made up of diesel molecules. Renewable diesel is a biofuel, but it is also chemically diesel on a molecular level. For fuel regulation they refer to it (as well as biodiesel) as “Biomass Based Diesel” for labeling at the fuel pump.

There have been billions of plant capacity brought online in the United States for renewable diesel. During the COVID market drop in fuel prices a number of petroleum refineries shut down, then upgraded their technology to make hydrocarbon diesel fuels out of the very biobased fats, oils, and greases biodiesel is made from. These refineries use hydrotreating technology just like they do with a crude petroleum to make an actual hydrocarbon diesel molecule. With this technology adoption to make diesel and jet fuels from vegetable oils and animal fats billions of gallons of low CO2 diesel fuels are coming on the market and governments are requiring it’s use, such as Portland’s Renewable Fuel Standard.

Renewable Diesel Consumption it the US Source: Alternative Fuels Data Center

THE AVAILABILITY OF BIODIESEL

The US makes billions of gallons of biodiesel. A fuel that’s quality and performance continues to improve. If you are not a fan of biodiesel in your fuel thinking strategically about the fuel will likely benefit your fleet operation. The big concern with diesel fuel in a ultra low sulfur world is water and dirt suspended in the fuel affecting the performance of diesel emission systems. With clean and drier quality specifications of B99 blend stocks today versus a decade ago the use of this fuel has grown substantially especially in the truck stop market.

When crude petroleum prices are high and therefore refined diesel prices are equally as high biodiesel is often an extremely competitive fuel. Recently changes in Federal subsidies on biodiesel have changed this market dynamic a bit but you can presume that biodiesel will often be sold at a discount against fossil fuel diesel. If a large seller of diesel (including petroleum refiners) can pick up pennies per gallons on millions of gallons sold they will do so. Therefore Biodiesel is often seen in diesel in small blends even if you do not see a label on retail pump. For blends above 5% a label is required for retail fuel sales.

R99 Renewable Diesel label indicating 99% biomass-based diesel content

Biodiesel Blend Percentage label for retail diesel dispenser

Above are a variety of labels used to denote what fuel blend is coming out of a retail diesel dispenser. Feel free to call Star Oilco at 503-283-1256 if this confuses you and you want it explained. We would be glad to do so.

These labels can be found together often at one pump. All state and Federal standards require ultra low sulfur diesel for any on-road diesel sale. The Federal standards also adopted by the states require a disclosure at the fuel pump if a blend is above 5% biodiesel. The max allowable blend of biodiesel for diesel truck manufactures is a 20% blend. If a truck dealership says that you cannot blend biodiesel up to 20% they need to take that up with the Federal Government because they need to support it. This is why the label shows a blend may contain between 5% and 20% biodiesel content.

Renewable diesel is a hydrocarbon diesel.

It is diesel meeting the ASTM D975 specification for diesel.

Retailers selling blends of R99 in their fuel do not need to label it given this. They still do label it given the benefits of the fuel’s performance and that customers are seeking that fuel.

Contact Us Today To Schedule Your Next Bulk Fuel Delivery

Many retail places will have stacked labels showing they may be blending 5% to 20% biodiesel as well as may be adding R99 Renewable Diesel to the fuel as market conditions dictate it is the more cost competitive fuel. When seeing a label like this it can usually be assumed they are blending a R80 (80% Renewable Diesel) and a B20 (20% Biodiesel) blend of fuel. This blend is actually believed by some to be a higher performing fuel seeing better performance that a R99 or B20 fossil fuel blend.

Fossil fuel diesels are being replaced or blended with biomass based diesels. Be it Renewable Diesel or Biodiesel. These blends are driven by more than one industry requirements, government rules, or other market forces. One of these being Portland’s banned on petroleum diesel through the Renewable Fuel Standard (RFS). This is resulting in an increase of low-carbon biofuel blends that will ultimately move to a mix of 99% renewable fuel requirement by 2030.

Renewable Diesel and Biodiesel Blend fuel dispenser label.

The big drivers are industry specification for fuels (both labeling as well as chemical characteristics), state rules on selling these fuels, their quality assurance as well as CO2 content, and of course the market forces. Market forces being the supply and demand availability of fuel needed to meet customers. Less fuel available to sell means higher prices for customers.

A decade ago the market for diesel was far simpler. Though you had biofuels and some blend mandates basically you had a diesel specification accepted and the daily price as tracked by a lighted retailers sign, a wholesale market average or spot buying by some customers. Today this market is far more complicated by government regulation on the west coast. There are three big programs at state levels impacting this.

State Fuel Rules cause a unique need for one state or another. Whereas twenty years ago if Oregon or Washington fuel was selling for more than the Gulf Coast you might see brokers bring fuel into the region then driving down high prices. With the creation of various complex and unique rules on diesel, imports of fuel to these low CO2 fuel states has dropped. The amount of people moving product into west coast states has dropped. The big rules causing this are the Cap and Invest programs of the West Coast states, the Low CO2 Fuel Standards of the states, and the fuel blend mandates of various jurisdictions of these states. For instance California now requires all off-road diesels but 99% renewable diesel. Portland, Oregon also has a CO2 requirement and minimum 15% blend of biomass based diesel on all fuel sold in the state.

WHAT ARE THE DIESEL FUELS AND THEIR SPECIFICATIONS

Petroleum Diesel:
ASTM D975 Specification.

The ASTM D975 is a series of tests used to maintain consistent industry standard product performance for diesel fuel. It includes among several tests cloud point, cold filter plug point (CFPP), several masurements of diesel fuel operability performance, intrained water content, sediment, carbon residue, ash, distillation, viscosity, sulfur, copper corrosion, cetane number, cetane index, aromaticity, and conductivity.

Renewable Diesel:
ASTM D975 Specification.

Renewable Diesel is following the same series of tests as petroleum refined diesel fuels. It is the same ASTM D975 specification. Though Renewable Diesel has some different properties that exceed the ASTM specification of diesel. Renewable Diesel is highly prized as a fuel because it typically is a cleaner and drier diesel fuel than petroleum diesel. This being seen by the tests on sediment and water content in a parts per million level. Renewable Diesel content in diesel fuel can also be tested for looking for a C14 molecule (the chain typically created in a Hydrotreated Diesel process from fats, oils and greases.

Biodiesel (Methyl Esther):
ASTM D6751 Specification.

The ASTM for Biodiesel tests a mono-alkyl esters of long chain fatty acids derived from vegetable oils and animal fats. The testing for quality assurance covers an analysis for flash point, methanol, water and sediment, kinematic viscosity, sulfated ash, oxidation stability, sulfur, copper strip corrosion, cetane number, cloud point, acid number, carbon residue, total and free glycerin, phosphorus, reduce pressure distillation temperature, atmospheric equivalent temperature, combined calcium and magnesium, and combined sodium and magnesium.

For more on Biodiesel Use and Handling the National Renewable Energy Laboratory has a great book on the subject.

THE HISTORY OF DIESEL FUEL SPECIFICATIONS IN THE UNITED STATES

In the 1990’s the US EPA passed rules that demanded a phase out of sulfur in diesel fuel. The presence of sulfur was very good for the fuel’s storage stability as well as fuel lubricity, but was horrible for air quality. Additionally the big smog contributor was NOx (nitrous oxide) which was one of the EPA’s reason’s for pulling sulfur out of diesel. For the EPA to get engine manufacturers to treat the NOx emissions at the tailpipe they needed all the sulfur gone (ultra low sulfur diesel) for modern diesel emission systems to be able to eliminate NOx as well as a host of other pollutants including particulates.

The story of changing diesel fuel standards in the US under the EPA is one of removing sulfur from our diesel fuel. In 1996 the fuel refiners and sellers of diesel had to move the sulfur content of the fuel sold for on-road purposes to below a 500 parts per million standard. Commonly referred to as Low Sulfur Diesel fuel. In 2006 the standard moved to a maximum of 15 parts per million of sulfur for all on road fuels.

In 2006 while the sulfur content of fuel was dropping the City of Portland released the first mandated blend of biodiesel content. This being a 5% biodiesel blend. The next year, the State of Oregon followed with its own Renewable Fuel Standard requiring this throughout the state. This began the expectation of biodiesel in most diesel fuel in the Portland, Oregon area. Washington also passed a similar policy for blending biodiesel but the enforcement and need for the fuel is less specific at Washington fuel pumps.

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Star Oilco truck refueling off-road diesel at a job site in Portland OR

June 12, 2026

Every Question We Have Been Asked About Renewable Diesel https://staroilco.net/wp-content/uploads/2024/06/IMG_9258-1024x768.jpeg 1024 768 Star Oilco Star Oilco //staroilco.net/wp-content/uploads/2022/10/StarOilco-Logo-RGB-C-Lg-Simple.png June 12, 2026 June 12, 2026

Every Question We Have Been Asked About Renewable Diesel

Renewable Diesel Frequently Asked Questions (FAQ)

What is renewable diesel?

Renewable diesel is a synthetic diesel fuel, known for it’s lower CO2 characteristics, typically seeing purity and real world performance response superior to petroleum diesel fuel. Renewable diesel is a next generation hydrocarbon diesel biofuel made by either the Fischer-Tropsch or Hydrogenation processes.

Hydrogenated renewable diesel is made by taking fats, oils, and greases by use of a hydro-treater. The biomass based oil or fat is cracked and reformed in the presence of hydrogen and catalyst forming a hydrocarbon diesel molecule.

Fischer-Tropsch renewable diesel is used by converting any btu dense feedstock (wood waste, woody biomass, municipal garbage, coal, and an endless list of low value waste products into syngas, then converting this into a wax that is reformed into hydrocarbon diesel.

Is it true that Renewable Diesel reduces CO2 emissions by more than half?

It depends on the feedstock and processes that determine the fuel pathway. But for the most part it is safe to presume that if you use a R99 Renewable Diesel product in Oregon that it will have a lower than 50CI which would cut the CO2 emissions in half versus an equivalent gallon of gasoline used. Sometimes Renewable Diesel can be blended with fossil fuel diesel as well as biodiesel. Star Oilco currently presumes 99% renewable diesel is the fuel being used when describing Renewable Diesel and “cutting emissions in half” as a claim, backed up by the scientific data associated with the Oregon Clean Fuels Program and its pathways.

According to the Oregon Clean Fuels Program list of pathways for Renewable Diesel approved to be sold in Oregon shows the lowest CO2 value to be 16.36 CI and the highest to be 65CI. Most, nearly all, of the Renewable Diesel pathways in Oregon are below 50% reduction in CO2 emissions associated with the fuel. You can see these by reviewing the downloadable spreadsheet of “Fuel Pathways – Carbon Intensity Values” available on the left hand side of the Oregon Clean Fuels Program website under the heading “Participating Facilities” as an easy sharable link is not available.

To learn more about this please see the Oregon Department of Environmental Quality’s Clean Fuels Program page where CO2 emission pathways are disclosed for renewable fuels distributed in Oregon. The system used to measure CO2 emissions and reduction is a modified Oregon “GREET” model. GREET stands for Greenhouse gas, Regulated Emissions, and Energy Use in Technology. The GREET scientific system to review CO2 emissions was developed by the US Department of Energy and similar systems are used by California and Washington in their Low Carbon Fuel Standards as well.

Is HVO or Hydrogenated Vegetable Oil the same as Renewable Diesel?

Yes. HVO is either R100 or R99 renewable diesel. The reason you will hear the phrase HVO or Hydrogenated Vegetable Oil instaed of renewable diesel is that the regulations and various incentives for renewable diesel have restrictions. If renewable diesel is used in stationary power generation it is treated differently for the various subsidies and incentives. The regulations on fuels for vehicles and equipment differ compared to utility scale power generation. For this reason the power generation industry will refer to renewable diesel as “HVO” to denote it’s end use.

Is Sustainable Aviation Fuel or “SAF” the same as Renewable Diesel?

No. Sustainable Aviation Fuel or “SAF” is a Jet A specification or a Number 1 diesel fuel. A Number 1 diesel fuel can be mixed with Number 2 without impacting it’s specification requirements. Number 1 though cannot be mixed with Number 2 diesel weights and stay in specification. It is a lighter end than Number 2 diesel meaning it has a different specific gravity weight of the fuel. So in short SAF can be used as Renewable Diesel but has a much higher standard to meet than is required for Renewable Diesel. Therefore the products are very different based on this need for quality assurance to meet the aviation jet fuel specification.

There is a huge demand for Sustainable Aviation Fuel and many of the current Renewable Diesel plants in operation are upgrading their technology to make SAF. It is expected that in the hydrotreating processes to make renewable diesel and SAF, the Jet A fuel specification is a harder one to produce. So as the refining of SAF increases we will expect to see subgrade SAF (product made to be SAF that does not meet the standard) be moved to the Renewable Diesel market. We will not see Renewable Diesel being used in jets though.

Can Renewable Diesel be used as Heating Oil?

Yes. Renewable Diesel is a synthetic hydrocarbon diesel fuel. It can be used interchangeably with petroleum diesel products of similar grade. Heating Oil is typically number 2 diesel which is the same specification as Dyed R99 Renewable Diesel (or blends of Renewable Diesel with petroleum diesel). Star Oilco now offers R99 Heating Oil delivered in the Portland metro region area of Oregon.

Most modern oil heat appliances use a Becket Burner. For more on heating fuel compatibility with oil furnaces and oil burning appliance please see “Alternative Fuels and Becket Burners” for more information.

Why do people use renewable diesel over petroleum diesel?

Fleet managers operating R99 Renewable Diesel report a lower mechanical cost of operation using the fuel. Beyond the immediate benefit of R99 cutting CO2 emissions by half or more, fleets experience performance benefits from the fuel. The big savings are seen the the performance of Tier 4 Emission systems on modern diesel seeing far less wear of the Diesel Particulate Filter system as well as far fewer regenerations of the system. Additionally Renewable Diesel is a very clean and dry diesel fuel improving the storage stability, field operation, and general predictability of the fuel’s performance.

How do I know Renewable Diesel is being sold at a retail location?

Renewable Diesel is a hydrocarbon diesel that meets the specification for petroleum diesel known as ASTM D975 specification. This means currently R99 can be readily blended and sold with petroleum diesel without a disclosure. The US Federal Trade Commission and local state Weights and Measures have rules for retail pump labeling. Blend percentages of biomass based diesel must be labeled especially if being advertised. As R99 Renewable Diesel has a higher value and is sought out by many consumers though usually it is disclosed. The pump labeling for R99 Renewable Diesel typically looks like the below.

What is renewable diesel made of?

Renewable diesel can be made from a host of things, usually a low value waste product. The most common feedstock used currently is waste vegetable oil, wastes from animal rendering, and other biologically derived oils. Processes using bio-oils are following a Hydrogenation process to turn low value waste oils into high value diesel and jet fuel.

Chevron Renewable Energy Group and Diamond Green Diesel (Diamond Green is in a joint venture with Valero) are the largest producer of renewable diesel with their REG Ultra Clean Diesel product in the United States. Neste is the largest producer of renewable diesel internationally, with its “Neste My” product. being the two largest producers of low CO2 bio-oil derived renewable diesel fuels.

Major petroleum refiners have also turned around existing petroleum refineries into Renewable Diesel Refineries to produce this in demand low CO2 fuel. HF Sinclair , Marathon, Phillips 66, and Montana Renewables. There are quite a few newer Renewable Diesel projects planned and in progress around the United States as well as in the Pacific Northwest.

Other refiners of renewable diesel (on a much smaller scale of production) are using a Fischer-Tropsch process with wood waste, sorted higher grade municipal garbage, and other high btu value carbon based waste products. Many expect this to technology to be the future of all diesel and jet fuel refining turning refuse into fungible low carbon fuel.

What is renewable hydrocarbon diesel?

Renewable hydrocarbon diesel is a synthetic diesel fuel made from non-petroleum feedstocks like vegetable oil, animal fats, municipal waste, agricultural biomass, and woody biomass. It is characterized by having a low CO2 and renewable resource for its feedstock and is made without crude petroleum, coal, or natural gas as a direct feedstock input in the refining process.

How do they make renewable diesel?

Renewable diesel is made by several processes. If you are buying renewable diesel, it is probably from a Hydrogenation process used by Renewable Energy Group and Neste for their products. Other smaller volume producers are using a Fischer-Tropsch process or Fast Pyrolysis. Both processes involve taking energy dense molecules, cracking those molecules under heat and pressure, then reforming them in the presence of a catalyst and added hydrogen, which forms a renewable diesel molecule.

Is renewable diesel a lower carbon fuel compared to petroleum diesel?

Yes, to this point all renewable diesel made from renewable feedstocks have appeared to be a lower CO2 fuel compared to petroleum diesels. The California Air Research Board in particular has done research on this in depth.

The low CO2 lifecycle emissions of Renewable Diesel also is tracked closely and supervised by California’s Low Carbon Fuel Standard, Washington’s Low Carbon Fuel Standard, and Oregon’s Clean Fuels Program. The highest value markets for low CO2 fuels in the United States are California and Oregon, which both have mechanisms that track and price the CO2 intensity of diesel fuels as well as the sustainable lower CO2 substitutes and blend-stocks that can go in those diesels. They track, rate, and determine the carbon intensity of the fuels providing a neutral and scientifically defensible number for CO2 reduction.

Is renewable diesel available in Oregon?

Renewable diesel is readily available for delivery from Star Oilco throughout the Pacific Northwest via 10,000 gallon volumes of bulk delivery. Star Oilco is also offering bulk delivery of any size and mobile onsite fueling service within 100 miles of the Portland, Oregon market.

Star Oilco has R99 Renewable Diesel available with a Star Oilco CFN Cardlock card in Portland, Oregon.

What is the difference between biodiesel and renewable diesel?

Biodiesel and renewable diesel are very different fuels made with very different processes. In a nutshell, biodiesel is made with a simple chemical reaction that turns vegetable and animal fats into fuel. Renewable diesel is made from far more complicated process where vegetable and animal fats (as well as other feedstocks) are cracked on a molecular level and built back into synthetic diesel fuel.

What is the difference between renewable diesel and Sustainable Aviation Fuel?

The difference between the fuels is the specific gravity and general specification for what the fuel is used for. Jet fuel, or Sustainable Aviation Fuel, and on-road diesel fuel are different fuels and therefore have different specifications. Renewable diesel is typically referring to a #2 diesel specification for on road diesel use.

Sustainable Aviation Fuel or “SAF” is typically referring to “Jet A” or “JP8” jet fuel specification for fuel. This is a #1 diesel range fuel with use and handling requirements that are far more stringent than for on-road or off-road diesel fuels. Renewable jet fuel can be used as a kerosene or #1 diesel fuel but renewable diesel cannot be used as a jet fuel.

Where do I buy renewable diesel in Oregon or Washington?

Renewable Diesel is currently available for bulk delivery and mobile onsite fueling. It will soon be offered at commercial cardlock in the Portland area. It is being sold as R99 and as Ultra Clean Diesel, which is a mixture of biodiesel, renewable diesel, and petroleum diesel.

What is R99?

R99 stands for 99% renewable diesel and 1% petroleum diesel. Federal rules over alternative diesel fuels made fuels requires that manufacturers of non-petroleum derived diesel fuels must blend a minimum 1% petroleum with the fuel to generate a Renewable Industry Number or “RIN” under the US Federal Renewable Fuel Standard. Additionally there are other incentives that require a “blender of record” to receive these tax credits.

Is renewable diesel being made in Oregon?

As of Spring 2022, renewable diesel is not being manufactured in Oregon. There is a major projects underway, Next Renewable Fuels in Port Westward, Oregon.

What is renewable diesel made from?

Renewable diesel can be made from many energy dense carbon based material. By volume of produced product sold in the United States, vegetable oils and animal fat-based wastes are the most common feedstock. Woody biomass, agricultural wastes, and sorted municipal wastes are also sources for renewable diesel production.

Is renewable diesel made from palm oil?

Palm oil can be used as a feedstock for renewable diesel. There are producers who use palm oil as a feedstock. In the United States, feedstocks and carbon intensity are tracked closely under both Oregon and California’s fuel programs. You can determine if a supplier is using palm oil as a feedstock through these regulated pathways.

How much does renewable diesel cost?

This is a tough question to answer given there are several markets intersecting. From the feedstocks to the market demand for the finished product as well as both California and Oregon’s Clean Fuel Standards which place a price on the CO2 intensity of the fuel which reduces the cost of the fuel if consumed in Oregon and California.

It has consistently been trending between the same cost and over $1 a gallon higher than petroleum diesel depending on the state, you buy renewable diesel in. In California, renewable diesel is very close to petroleum diesel depending on the value of CO2 credits for lower-carbon fuels. In Oregon, it has consistently been between $.05 to $.80 a gallon higher than diesel also depending on the value of CO2 abatement associated with the fuel and what these carbon credits are trading for.

When petroleum diesel costs are high Renewable Diesel tends to be more competitive with petroleum diesel. When petroleum diesel is below $3 a gallon the cost of Renewable Diesel by comparison is usually higher unless CO2 credits are in higher than normal demand for Clean Fuels Program demands.

Can you mix petroleum diesel and renewable diesel?

Yes. Renewable diesel and petroleum diesel can be blended in any mixture without worry. They are drop-in substitutes for each other in your fleet’s use. Renewable Diesel is a drop-in fuel. It is a hydrocarbon diesel that will work mixed with diesel or biodiesel blends of petroleum diesel.

Learn more about renewable diesel and how it can benefit your operations. Contact us today.

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June 10, 2026

Do Diesel Soaps Cause Engine Problems? https://staroilco.net/wp-content/uploads/2025/08/IMG_1772-1024x768.jpeg 1024 768 Star Oilco Star Oilco //staroilco.net/wp-content/uploads/2022/10/StarOilco-Logo-RGB-C-Lg-Simple.png June 10, 2026 June 19, 2026

Do Diesel Soaps Cause Engine Problems?

Cliff Burbrink, chemical technology specialist at Cummins Filtration, provides a layman’s definition of diesel soaps:

“Diesel soap is not very different chemically than the soap used to wash your hands. The main ingredient in a bar of soap is formed when lye reacts with fats or oils. Lye is sodium hydroxide.

Fats and oils contain fatty acids. When they react, they form sodium soaps. Diesel soaps are formed from acidic additives in the fuel [such as some corrosion inhibitors and lubricity improvers] reacting with trace amounts of sodium.”

Rick Chapman, Industry & OEM Liaison Manager, Innospec Fuel Specialties, adds that acids can be derived also from other sources:

“[Soaps] can also be formed from free fatty acids in biodiesel starting materials and carboxylic acids derived from oxidatively degraded fuel and/or biodiesel.”

From a layman’s point of view, then, the formation of diesel soaps is the result of metals, such as sodium, calcium and potassium (in the form of positively charged ions, or cations), reacting with various sources of acid in the fuel.

“When these two species [acidic compounds and cations (usually sodium)] come together, diesel soap can form,” says Chapman.

“There are a lot of other factors or variables that can play into it, of course, such as pH, solubility, mixing intensity and so forth—but this is the basis for it. Unfortunately, when these soaps form, assuming they are formed from additives, they make the corrosion inhibitor or lubricity improver inert, and the corrosion or lubricity protection provided by the additive is lost.”

Plug fuel filters
Form injector deposits that lead to over-fueling
Create Turbocharger problems
Generate Oil dilution
Cause Poor performance, and poor fuel economy

In a May 2013 report, “Case Study—Impact of Poor Diesel Fuel Quality on an Urban Fleet,” Cummins Filtration investigated problems with diesel engines in a New York City bus fleet.

Complaints ranged from an excessive number of turbocharger fault codes to smoke at start-up to fuel-injector failures. The investigation uncovered excessive soot deposits in the turbocharger, resulting from over-fueling, which was determined to be the result of fuel injectors sticking because of deposits that were “rich” in the metals of sodium and calcium.

Although injectors showed sign of scuffing—the result of hard particle contamination, which, says the report,

“is the greatest fuel quality concern for high-pressure/common-rail fuel systems, worldwide”

—investigators determined that scuffing was not the primary issue for the immediate problems the bus engines were exhibiting.

The culprits in this instance were “metal carboxylates” in the fuel, more commonly know as “diesel soaps.” The recommended fix for the problem was use of a fuel additive that could both clean the Injectors and minimize further deposits, coupled with much tighter filtration.

Biofuel is manufactured by reacting a plant-derived fat or oil (usually soybeans in the United States) with an alcohol, using sodium hydroxide as a catalyst. An unwanted by-product of the process is glycerin.

Although most of the glycerin is washed out during the manufacturing process, regulations do allow 200 ppm to remain.

Biofuel usually is mixed with petroleum diesel in 5-, 10- or 20-percent concentrations to form biofuel blends, but even at these relatively low concentrations, enough glycerin remains to create filter-plugging problems when, under certain fuel moisture and temperatures conditions, it becomes a solid and drops out of solution.

To help counteract glycerin’s effects, Jim Peterson, sales manager for Donaldson’s Hydraulics and Clean Solutions Group, suggests these measures:

Filter fuel on the dispensing side of the bulk tank and use proper on-machine filters
Keep fuel dry with proper tank flushing and proper breathers
If possible, moderate the temperature of stored fuel above the glycerin dropout level
Turn over fuel as quickly as possible
Keep fuel infrastructure as free from particulate contamination as possible
Ask OEMs about using detergent additives to keep glycerin in solution, both in equipment and bulk storage

As noted before, the contamination of diesel fuel with soaps is not as prevalent, at least in many fleets, as other sources of fuel contamination.

These other fuel contaminates include hard particulates, increased water in biofuel blends, rapid oxidation of such blends, microbial growth, so-called asphaltenes (compounds that can agglomerate into an oily sludge), acetic acid formation and glycerin.

Glycerin being an unwanted by-product of biofuel manufacturing. “There are so many inherent problems with diesel fuel today,” says Hydrotex’s Cummins, “that machine owners must take a holistic approach when attempting to resolve them.”

The best defense against diesel soaps (and for most other contaminants, as well) seems to be the use of premium filtration, like the “Donaldson clean & Dry kit which includes 4 micron particulate and water filters. The kit also incorporates a desiccant breather to absorb moisture.”

In addition, (tank intake, tank dispensing, and on-machine), good tank housekeeping, and a well-chosen additive package.

Additives might be included in “premium” diesel fuel offered by some jobbers, but solving a serious soap problem might require consultation with an additive supplier who can take a comprehensive, laboratory-assisted view of all the fuel-quality issues in a particular fleet.

But, the best efforts are no guarantee of complete success when dealing with diesel soaps.

“We’ve seen soap deposits form in engines that use our most effective filters—those proved to remove 99.9 percent of material 4 microns and larger and significant amounts of material smaller than 4 microns,” says Cummins Filtration’s Burbrink.

“If soap particles don’t agglomerate before the filter, they can pass through it. When they hit the injectors, the heat can cause these particles to deposit on metal.”

“We have seen great success with some additives,” says Burbrink. “The use of good detergents has dropped the failure rate significantly in some applications. Unfortunately, we also have seen customers having issues even though they are using detergents.”

That said, a well-formulated additive package seems to be an integral part of the potential resolution of problems with diesel soaps.

A good, multi-functional package will contain corrosion inhibitors and lubricity improvers (some formulations use nonacid, non-reacting lubricity improvers), as well as a deposit-control agent that will assist in cleaning injectors and minimizing further deposits.

“The key to diminishing field issues is the use of a two-prong strategy,” says Innospec’s Chapman. “One, use an additive that provides the required lubricity but is resistant to reaction with metal hydroxides, and, two, use a deposit-control additive to ‘clean up’ and ‘keep clean’ any deposits that may form, regardless of the their source. Deposit-control additives are useful for reducing injector deposits, reducing filter plugging, and for carrying through trace amounts of water. In lower-dose rates, or at a ‘keep-clean’ level, they will put a protective coating on metal surfaces and not allow deposits to form—or will limit their formation.”

Hydrotex’s Cummins makes the point, too, that treatment rates for additives, a corrosion inhibitor, for example, might have to be adjusted to meet the conditions of a particular storage tank. Cummins also reminds machine owners that deposit-control additives might need time to work in certain situations: “Soap deposits can get very deep into the injectors, become sticky, and cause poor actuation of the pintle. A good additive package will help clean the injectors, but given the nature of the deposits, it’s usually not a quick fix. The process might require four or five tanks of treated fuel before improvement is noticed.”

Sunrock’s Dennis offers this suggestion to fellow fleet managers: “I would recommend that fleet managers, if they haven’t already done so, educate their fuel suppliers on the subject of upstream fuel-contamination issues and their effects on diesel engines.

Managers can use that opportunity to register their concerns about diesel soaps—for the purpose of promoting a partnership in utilizing countermeasures against diesel-fuel contamination. Their fleet reliability depends on it.”

To read more technical data on Diesel Soap click link below

SOAP AND GLYCERIN REMOVAL FROM BIODIESEL

multi colored fuel pump nozzles indicating different fuel types at Portland fueling station

June 5, 2026

Clear Premium Non-Ethanol Gasoline https://staroilco.net/wp-content/uploads/2024/06/different-colours-gas-station-pumps-683x1024.jpg 683 1024 Star Oilco Star Oilco //staroilco.net/wp-content/uploads/2022/10/StarOilco-Logo-RGB-C-Lg-Simple.png June 5, 2026 June 5, 2026

Clear Premium Non-Ethanol Gasoline

Do you need Non-Ethanol Gasoline delivered in the Portland, Oregon area?

If you are looking for Non-Ethanol Premium Gasoline delivered to your bulk tank or available at a Commercial Cardlock, Star Oilco has your needs covered in the Pacific Northwest.

Premium Unleaded without Ethanol in the Gasoline

Nonoxy Premium is the fuel you want in a gasoline tank if you are storing equipment with a full tank of fuel.

Premium gasoline without any ethanol blended into it goes by several names. Clear premium unleaded, Non-Oxy (non-oxygenated) premium, nonethanol gasoline, or Clear 91 Octane are a few of the terms used. Regardless of what it is called, getting gasoline without ethanol in the Portland, Oregon area requires buying a premium rated gasoline.

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Clear Gasoline Premium bulk tank delivery

Why is the only ethanol free gasoline in Oregon and Washington premium grade of 92 octane?

This is because of several laws in Oregon as well as Washington that require the blending of 10% ethanol with all gasoline with the exception of premium grades for small engines, classic cars, aviation uses, and other type specification needs.

With the blend requirements for 10% ethanol this changed the way gasoline was supplied in the Pacific Northwest. This was caused by the octane ratings of gasoline. Regular gasoline is a 87 octane rating. E98 ethanol has a 107 octane rating. With this blend requirement, the gasoline changed to account for the high octane of ethanol. So refiners and sellers of gasoline began to use what the industry calls a “sub-octane” gasoline at 85 octane because the guaranteed blend of 10% ethanol would boost the octane rating back up to 87 octane.

This is usually where people ask: “Why does this effect premium unleaded as well, and why the heck is clear premium so expensive?”

There are three reasons nonoxygenated gas costs more:

1- Ethanol is a lower cost fuel than gasoline, so less ethanol means a slight higher price of the fuel.

2- Fewer terminals carry a non-ethanol option for Premium unleaded reducing options for customers demanding the fuel and therefore higher prices.

3- CO2 regulations have raised the cost of fuels without biofuel blends in them as well.

REASON 1

The reason why is for several decades before the 10% ethanol blend mandate, the industry has been upgrading retail gas stations, cardlocks, and truckstops to blend regular gasoline and premium gasoline to the midgrade gasoline at the island. With a 10% ethanol blend mandate for regular unleaded and midgrade this required any and all retailers with blending pumps to use E10 (10% ethanol) premium to be legal with their midgrade product sold. This also means that a non-ethanol premium pump requires a stand alone pump, line set up, and infrastructure need.

REASON 2

The blend mandates for gasoline caused all of the major branded gas station chains to move to a defacto 10% blend at the terminal level reducing availability of non-ethanol or “Clear” premium gasolines. With far fewer petroleum terminals, brokers, refiners, and other upstream wholesale dealers of gasoline exiting the non-ethanol gasoline market due to far lower volumes of it, the price went up. This also means that there is far less volume of ethanol free premium unleaded being sold at the wholesale level. Reducing the volume of sales of a single fuel grade raises the cost risk in a volatile commodity market like gasoline.

REASON 3

Recently the entire western coastal states (Oregon, Washington, and California) passed laws around CO2 emissions and liquid fuels like gasoline. This means that there is a cost for fossil fuels over biofuels which prices into the gallon of fuel. The less biofuel the higher the CO2 cost for those buying it. Add to that the western states have Cap and Invest rules which put a total limit on volumes of fossil fuels. These “Cap at the Rack” charges for fossil fuel have been as high as a full $1 for a gallon of fossil fuel in past years. Cap at the Rack charges on fossil fuel gasoline is usually in the $.40 a gallon added cost range of the price you pay.

If Clear Premium Gas is so expensive why do people still use it?

It is the optimal fuel for small engines that have a habit of being stored for long periods of time without use. Nonethanol fuel stores stable for a longer time and has a better cold start performance than an E10 gasoline fuel that has sat for over a year. Add to that it also does not absorb water or impact plastic/rubber/elastomer seals in equipment. That is why people prefer it. Sure, the limited availability of terminals carrying this product makes it a specialty in Oregon and Washington. But the added cost is worth it for sensitive low tolerance engines or for vehicles with long periods of storage between uses.

StarOilCo

Diesel Backup Tanks – Treating and Refilling

Here’s good advice if you are relying on diesel as a back up fuel in the Pacific NW.

Now is the time to refill and treat your back up fuel tanks.

Technical advice from Government Fleet Magazine to help you with storing diesel fuel.

Look at your fuel for a bright and clear color.

Use additives designed to prolong the life of your emergency diesel fuel.

Water in diesel destroys fuel quality rapidly. Check your tank for water every fall and spring.

Star Oilco will test your fuel at no charge if you have an open account.

Tank Testing Form

For more reading on diesel fuel quality assurance:

What Types of Feedstock Can Be Used To Make Biodiesel?

What Types Of Feedstock Can Be Used To Make Biodiesel?

To answer what feedstocks can be used to make biodiesel we need to first answer: What is Biodiesel?

Babussa Oil & Beef Tallow

Babassu Oil

Beef Tallow

Use Pacific Pride Cardlock to Fuel your Portland, Oregon Fleet

Seize Control of Your Fuel Spending with Pacific Pride Cardlock

We are your partner in Fleet Card and Cardlock Card success.

Imagine how this works for your business in practice

Seize control with Star Oilco’s corporate fleet card solutions.

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Star Oilco is a proud Independent Franchisee of Pacific Pride

Portland Renewable Fuel Standard Explained

Did you hear about the time Portland banned fossil fuel diesel?

Portland’s Phases To Implement Almost 100% Renewable Diesel

Want to learn more about meeting Portland’s requirements for the Renewable Fuel Standard mandate?

Focus on Lower-Emission Biofuels

Exemptions and Implementation Details

Impact on Businesses and Consumers

Contact Us Today To Discuss What This Means For Your Business

A Step Forward for Cleaner Transportation

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Star Oilco Diesel Fuel Quality Assurance

Star Oilco Diesel Fuel Quality Assurance

“Diesel fuel quality has deteriorated for the past 20 years and is expected to continue this trend for the foreseeable future.”

COMMON PROBLEMS WITH 21st CENTURY DIESEL FUEL IN THE PACIFIC NW

Tank Testing Form

Diesel Exhaust Fluid (DEF) Quality, Storage, and Future Considerations

Understanding DEF Quality and Purity

DEF Storage Best Practices to Prevent Contamination

How Temperature Affects DEF Performance

DEF Supply Chain Considerations

The Economics of DEF for Fleet Operations

DEF System Failures: Causes and Prevention

The Future of DEF and Emissions Technology

DEF Myths and Misconceptions

How Star Oilco Ensures High-Quality DEF for Customers

For more information on our DEF solutions, contact Star Oilco today to learn how we can help keep your fleet running efficiently while meeting emissions compliance standards.

Frequently Asked Questions

The Future of Diesel Fuel

The Future of Diesel is Low CO2 Synthetic Fuels

Diesel Fuel in Oregon and Washington

THE RISE OF RENEWABLE DIESEL

THE AVAILABILITY OF BIODIESEL

Renewable diesel is a hydrocarbon diesel.

It is diesel meeting the ASTM D975 specification for diesel.

Retailers selling blends of R99 in their fuel do not need to label it given this. They still do label it given the benefits of the fuel’s performance and that customers are seeking that fuel.

Contact Us Today To Schedule Your Next Bulk Fuel Delivery

WHAT ARE THE DIESEL FUELS AND THEIR SPECIFICATIONS

THE HISTORY OF DIESEL FUEL SPECIFICATIONS IN THE UNITED STATES

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Every Question We Have Been Asked About Renewable Diesel

Renewable Diesel Frequently Asked Questions (FAQ)

What is renewable diesel?

Is it true that Renewable Diesel reduces CO2 emissions by more than half?

Is HVO or Hydrogenated Vegetable Oil the same as Renewable Diesel?

Is Sustainable Aviation Fuel or “SAF” the same as Renewable Diesel?

Can Renewable Diesel be used as Heating Oil?

Why do people use renewable diesel over petroleum diesel?

How do I know Renewable Diesel is being sold at a retail location?

What is renewable diesel made of?

What is renewable hydrocarbon diesel?

How do they make renewable diesel?

Is renewable diesel a lower carbon fuel compared to petroleum diesel?

Is renewable diesel available in Oregon?

What is the difference between biodiesel and renewable diesel?

What is the difference between renewable diesel and Sustainable Aviation Fuel?

Where do I buy renewable diesel in Oregon or Washington?