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No. Biodiesel and renewable diesel are different fuels. They can start with the same vegetable oils, animal fats, or used cooking oil, but they are made by different chemical processes and have different fuel specifications. Biodiesel is an ester fuel normally made by transesterification; renewable diesel is a hydrocarbon made most often by hydrotreating. That difference determines whether a fuel is a direct diesel replacement, how it behaves in cold weather, and which engine approvals apply.
The short answer
The U.S. Department of Energy (DOE) states it plainly: “Renewable diesel and biodiesel are not the same fuel.” Renewable diesel is chemically similar to petroleum diesel and, when it meets ASTM D975, can generally be used as a replacement fuel. Biodiesel is a mono-alkyl ester sold most often as a blend with petroleum diesel; the finished blend and the vehicle’s warranty determine compatibility.
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The word “renewable” describes the source of carbon, not a universal performance or climate result. Feedstock, processing route, blend level, local specifications, temperature and lifecycle accounting all matter.
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How the fuels differ at a glance
| Topic | Biodiesel | Renewable diesel |
|---|---|---|
| Chemistry and usual process | Mono-alkyl ester, commonly fatty acid methyl ester (FAME), made by transesterification | Hydrocarbon made most often by hydrotreating or hydroprocessing |
| Typical U.S. specification | B100 blendstock: ASTM D6751; B6–B20 blends: ASTM D7467 | ASTM D975 petroleum-diesel specification |
| How it is used | Usually B5 or B20; B100 is commonly a blendstock | Replacement fuel or blend with petroleum diesel in any proportion, subject to applicable guidance |
| Engine compatibility | Depends on blend percentage, vehicle approval and warranty | DOE describes D975-compliant fuel as compatible with existing diesel infrastructure and engines |
| Cold-weather behavior | Varies with blend, feedstock and petroleum diesel; lower percentages generally flow better | Can be produced to a range of cloud-point requirements |
| Energy content | Higher biodiesel percentages contain less energy per gallon than petroleum diesel; B20 is about 1%–2% lower | Hydrocarbon composition is close to diesel, but actual fuel properties depend on the product specification |
ASTM specifications are U.S. standards and are updated over time. Ask the supplier which current standard the delivered fuel meets rather than relying on a product name alone.
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How biodiesel is made
Transesterification creates the fuel
Biodiesel is made by reacting fats or oils with a short-chain alcohol, usually methanol, in the presence of a catalyst. The reaction breaks the oil’s triglycerides into mono-alkyl esters and glycerin. When methanol is used, the esters are called fatty acid methyl esters, or FAME.
DOE’s illustrative production balance uses approximately 100 pounds of oil or fat and 10 pounds of short-chain alcohol to produce about 100 pounds of biodiesel and 10 pounds of glycerin. It is an example rather than a guarantee for every plant; catalysts commonly include sodium or potassium methoxide, and actual yields vary with the feedstock and process.
Raw vegetable oil is not biodiesel
Unprocessed plant oil, animal fat or recycled grease should not be poured into a diesel vehicle. Its viscosity is too high for normal fuel-system design and can cause deposits, piston-ring sticking, lubricant gelling and other maintenance problems. The chemical conversion—and the quality controls that follow it—are what produce fuel that can be called biodiesel.
How renewable diesel is made
Hydrotreating produces a hydrocarbon
Commercial renewable-diesel facilities described by DOE most often use hydrotreating: lipids react with hydrogen at elevated temperature and pressure over a catalyst. The oxygen is removed and the resulting hydrocarbon molecules are refined into diesel-range fuel. Because the product is a hydrocarbon rather than an ester, it can meet ASTM D975, the same U.S. specification used for petroleum diesel.
Other pathways exist
DOE identifies gasification, pyrolysis, and biochemical or thermochemical routes as possible renewable-diesel pathways. It also describes routes involving sugar upgrading and hydrothermal processing. Those options should not be confused with the lipid-based hydrotreating used at the commercial facilities discussed on the DOE data pages.
In Europe, DOE notes that renewable diesel does not meet EN 590’s minimum-density requirement but does meet EN 15940 for paraffinic diesel fuels. A European vehicle or fuel contract therefore needs a region-specific specification check; U.S. ASTM D975 language is not a worldwide approval.
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- Effective as a “quick-kill” biocide and for long-term diesel fuel maintenance, effective in all diesel fuels, including Ultra Low Sulfur Diesel (ULSD), biodiesel and biodiesel blends
- Kills microbes (bacteria and fungus) that grow in dispersed and free water associated with diesel fuels, safe for use in all diesel engines
- Prevents fuel-filter plugging – helps prevent fuel system failures; Protects fuel system components against organic acids created by microbial growth – prevents fuel tank corrosion
- Improves fuel performance and reduces engine maintenance costs and will not void engine manufacturer's when used as directed
Feedstocks: overlap does not mean identical fuel
Both fuels can use vegetable oils, animal fats, used cooking oil and other fats or greases. Biodiesel producers commonly use soybean oil, canola-type oils, yellow grease, restaurant oil and animal fats. DOE identifies used cooking oil and inedible animal fats as primary U.S. renewable-diesel feedstocks, while newer oilseed crops such as camelina, Brassica carinata and CoverCress are also being commercialized.
Renewable-diesel technology is not limited to lipids in principle, because gasification, pyrolysis and other routes can start with different carbon sources. The feedstock affects yield, fuel properties and lifecycle emissions, so “made from waste oil” or “made from soy” is more informative than the renewable label alone.
Several producers can compete for the same waste oils and fats while selling chemically different products. Feedstock availability, land-use effects and sustainability therefore require a defined region, feedstock and accounting method; they cannot be inferred from the fuel name.
U.S. standards and what they mean for a vehicle
Renewable diesel under ASTM D975
Renewable diesel that meets ASTM D975 is generally treated as a replacement for petroleum diesel in the United States. DOE describes it as usable in existing diesel infrastructure and engines, either alone or blended with petroleum diesel. Confirm the supplier’s certificate or specification, because a fuel marketed as renewable may still be subject to local handling or contract requirements.
Biodiesel under ASTM D6751 and D7467
B100 is the biodiesel blendstock specification ASTM D6751. Finished B6–B20 blends use ASTM D7467. A label such as B20 means up to 20% biodiesel and approximately 80% petroleum diesel by volume; it does not identify the feedstock or guarantee identical cold-flow properties.
Many manufacturers approve B20, and current diesel engines can generally use B20 and lower blends without modification. That general statement is not a warranty: the owner’s manual, warranty language, engine maker and fuel supplier control the decision for a particular vehicle. Higher blends, including B100, may require explicit approval and different maintenance practices.
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Compatibility checklist for owners and fleets
- Read the owner’s manual and warranty. Look for the maximum biodiesel blend, approved fuel standards and any temperature restrictions.
- Identify the actual fuel. Ask whether it is D975 renewable diesel, B5, B20, B100 or another blend, and request the applicable specification.
- Check the operating temperature. Obtain the fuel’s cloud point and cold-flow guidance for the location and season.
- Plan the first fill. Higher biodiesel blends can loosen old deposits and temporarily clog filters; keep a replacement filter available when changing an older vehicle to a high blend.
- For a fleet, document the approval. Match each engine family to the fuel contract, storage procedure, blend and seasonal temperature plan.
Do not assume that because one diesel vehicle accepts B20, every vehicle, generator or boiler in the fleet does. Approval is model- and blend-specific.
Energy, lubricity and handling performance
Energy per gallon
DOE reports that B20 contains about 1%–2% less energy per gallon than petroleum diesel. Many users report no noticeable change in everyday performance or fuel economy at that blend, but higher biodiesel percentages reduce volumetric energy content further. A fuel-economy comparison should therefore state the blend and the vehicle rather than treating “biodiesel” as one fixed product.
Lubricity and cetane
Biodiesel can improve diesel-fuel lubricity and raise cetane. DOE’s benefits guidance says 2% biodiesel is almost always enough to provide adequate lubricity, although the amount needed depends on the petroleum diesel’s properties. That observation is not an instruction to dose fuel yourself; use a compliant commercial fuel and follow the engine maker’s advice.
Flash point and storage
DOE lists biodiesel’s flash point as above 130°C, compared with about 52°C for petroleum diesel. Flash point is a handling characteristic, not a promise that a vehicle will consume less fuel or produce fewer lifecycle emissions. Storage stability, water control, tank cleanliness and turnover remain important for biodiesel blends, especially at higher percentages.
Filter changes after switching
Biodiesel’s solvent action can dissolve deposits that accumulated in a petroleum-diesel system. Those materials may collect in the fuel filter when a vehicle first changes to a higher blend. A planned filter inspection or replacement is prudent for older equipment, but the exact interval should follow the manufacturer’s maintenance schedule.
Cold-weather performance
Cold behavior is a property of the finished fuel, not simply of its name. Biodiesel’s cloud point and plugging behavior vary with feedstock and blend percentage, and the petroleum diesel in the mixture matters too. Lower biodiesel percentages generally retain better cold performance.
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- DUAL PHASE CHEMISTRY. Partitions both water and fuel phases for more effective and complete protection against microbes that cause contamination and corrosion. Prevents corrosion of fuel tanks and metal components caused by the acidic by-products of microbial growth.
- EXTENDS FUEL FILTER LIFE. Excessive sludge accumulation, clogged fuel filters and expensive fuel polishing can shut down engines. Proactive use of a biocide prevents biomass accumulation in fuel tanks, extends fuel filter life and inhibits microbial influenced corrosion.
- INCREASES LUBRICITY. As an added benefit, BioborJF has been proven to increase the lubricity properties of jet fuel, providing additional protection and reduced wear to fuel delivery components.
- OEM APPROVED. Proven to restore lubricity levels, exceeding ASTM standards and protecting injectors and pumps from premature wear. (ASTM-D6079 HFRR- engine manufacturer and industry standard testing).
DOE says B5 typically performs about like No. 2 diesel in cold weather. B20 and higher blends can require seasonal planning because biodiesel crystals may form at higher temperatures than those in the surrounding petroleum diesel. Suppliers may add cold-flow improvers, but an additive cannot make fuel operate reliably below its actual cloud point.
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Renewable diesel can be produced to meet a range of cloud-point requirements. That gives refiners more control, but the delivered product still needs a temperature specification. Request the supplier’s value rather than assuming every renewable-diesel batch has identical winter performance.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Lifecycle emissions: why there is no universal winner
Tailpipe pollutants and lifecycle greenhouse-gas emissions answer different questions. Tailpipe measurements describe what an engine emits during operation; lifecycle carbon intensity includes feedstock production, processing, transport and other system boundaries. A lower number in one category does not automatically establish a winner in all categories.
| Fuel or case | Reported figure | Scope and qualification |
|---|---|---|
| Petroleum diesel | About 95 g CO₂-equivalent per MJ | Typical carbon intensity cited by DOE/NREL’s Sixth Edition Biodiesel Handling and Use Guide, drawing on Xu et al. (2022) |
| Biodiesel from waste cooking oil | About 18 g CO₂-equivalent per MJ | Lifecycle estimate cited by the DOE/NREL guide; feedstock-specific |
| Biodiesel from soybean oil | About 21 g CO₂-equivalent per MJ | Lifecycle estimate without the cited indirect land-use-change addition |
| Biodiesel from soybean oil including indirect land-use change | About 30 g CO₂-equivalent per MJ | Lifecycle estimate with that additional effect included |
| Soy B100 | 67%–77% lower lifecycle greenhouse-gas emissions than petroleum diesel | Estimate for soybean B100 in the DOE/NREL guide; not a tailpipe result |
| Renewable diesel in California | Average 65% lower carbon intensity than petroleum diesel | California Low Carbon Fuel Standard certified carbon intensities; not a universal result for every pathway or location |
The underlying documents and years matter. For example, the California figure is an average from certified LCFS carbon intensities, while the biodiesel numbers are feedstock-specific lifecycle estimates. Neither supports a blanket claim that every renewable-diesel product beats every biodiesel product.
DOE says biodiesel can reduce soot, particularly in older engines and engines without diesel particulate filters, but the result depends on engine design, calibration and operation. In home-heating and boiler studies cited by the handling guide, soot reductions reached up to 60% for B100 and were about 10% for B20; those figures are not on-road vehicle results. DOE also notes a cited study found renewable diesel reduced NOx versus petroleum diesel, but the AFDC summary does not establish one general percentage for all engines and fuels.
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- KILLS & PREVENTS BACTERIA. Highly effective biocide to kill and prevent microbial growth in fuels and tanks (bacteria & fungi). Lubricates injectors and fuel pumps.
- DUAL PHASE CHEMISTRY. Partitions both water and fuel phases for more effective and complete protection against microbes that cause contamination and corrosion. Prevents corrosion of fuel tanks and metal components caused by the acidic by-products of microbial growth.
- EXTENDS FUEL FILTER LIFE. Excessive sludge accumulation, clogged fuel filters and expensive fuel polishing can shut down engines. Proactive use of a biocide prevents biomass accumulation in fuel tanks, extends fuel filter life and inhibits microbial influenced corrosion.
- INCREASES LUBRICITY. As an added benefit, BioborJF has been proven to increase the lubricity properties of jet fuel, providing additional protection and reduced wear to fuel delivery components.
- OEM APPROVED. Proven to restore lubricity levels, exceeding ASTM standards and protecting injectors and pumps from premature wear. (ASTM-D6079 HFRR- engine manufacturer and industry standard testing).
The DOE/NREL Biodiesel Handling and Use Guide, Sixth Edition provides the detailed assumptions behind the biodiesel figures. Use the original system boundary when comparing another fuel pathway.
Availability and the U.S. market
Renewable diesel use in the United States is concentrated in California, where Low Carbon Fuel Standard economics create strong demand. DOE says nearly all domestically produced and imported renewable diesel is used in California. That is a market pattern, not proof that the fuel is unavailable elsewhere; regional terminals and suppliers determine actual access.
U.S. domestic renewable-diesel production reached 3,194 million gallons in 2024, while consumption reached 3,671 million gallons, according to the Energy Information Administration data reproduced on DOE’s Renewable Diesel Production and Consumption page. DOE reports production grew 23% and consumption 28% from 2023 to 2024. These are U.S. 2024 figures and do not describe global volumes or 2025–2026 consumption.
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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteBiodiesel moves from plants to terminals and wholesalers by truck, train or barge; B5 is sometimes transported by pipeline. Distributors commonly deliver B20 or B100 according to retailer and fleet preference. Local price, supply continuity and the exact delivered blend are therefore more useful purchasing facts than a national “best fuel” ranking.
Which fuel fits which situation?
For a personal diesel vehicle
Start with the manual and warranty. If they approve B20, buy a clearly labeled, specification-compliant B20 from a reputable supplier and account for seasonal cold-flow requirements. If the vehicle is approved only for petroleum diesel or D975 renewable diesel, do not substitute B100 or an unapproved biodiesel blend. A D975-compliant renewable diesel is generally the simpler replacement option, but confirm the fuel specification at the pump or with the supplier.
For a fleet manager
Compare delivered fuel cost, guaranteed specification, supply reliability, storage turnover, operating temperatures and each engine maker’s approval. Ask suppliers for seasonal cloud-point information and a written blend plan. Record which vehicles can use B20, which require lower blends and whether any equipment is limited to D975 fuel.
For a climate or procurement analysis
Specify the geography, feedstock, production pathway, year and lifecycle boundary. Compare certified carbon-intensity values on the same basis, and keep tailpipe pollutants separate from lifecycle greenhouse gases. A California LCFS average cannot be transferred directly to an unregulated market or to a different renewable-diesel pathway.
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- Calling straight vegetable oil or used cooking oil “biodiesel.”
- Assuming renewable diesel and biodiesel are interchangeable because both can be made from waste fats.
- Putting B100 in an engine whose warranty approves only B5 or B20.
- Treating every B20 as having the same cloud point, energy content or feedstock.
- Using a California carbon-intensity average as a global emissions result.
- Equating a tailpipe soot or NOx observation with lifecycle greenhouse-gas performance.
- Assuming a national production statistic guarantees local retail availability.
Sources and standards guidance
For definitions and current U.S. fuel guidance, consult DOE’s Biodiesel Fuel Basics, Biodiesel Blends, Biodiesel Production and Distribution, Biodiesel Benefits and Considerations and Renewable Diesel pages. ASTM standards themselves are maintained separately and may change; verify the current edition through your fuel supplier or standards provider before writing a purchase specification.
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