Check the current owner’s manual for your exact vehicle—make, model year, engine and market—and use only a biodiesel blend at or below its stated limit. Follow any conditions on fuel quality, maintenance, storage and cold-weather operation. If the manual is unclear, ask the manufacturer or dealer to confirm the approved blend for your VIN. A general statement that diesel engines can use biodiesel does not establish that your vehicle can use B20.
Why the exact vehicle matters
Biodiesel compatibility is not a single yes-or-no rule for every diesel vehicle. Approval can depend on model year, engine, market and the conditions in the vehicle’s fuel instructions. A manual for a similar vehicle—or even the same model name from another year or country—may not apply to yours. Manufacturer guidance can also distinguish between fuel blends or operating circumstances, so the presence of one approved blend in a manual should not be treated as permission to use every blend below or above it without checking the full instructions.
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EPA consumer guidance says biodiesel concentrations up to B5 are approved for safe operation in any diesel engine. That general statement is not approval for B20 or a higher blend in a particular vehicle. The National Renewable Energy Laboratory (NREL), in its 2023 Biodiesel Handling guide, reports that all known on-road and off-road vehicle OEMs had approved blends up to B5 when the biodiesel met ASTM D6751 or the European EN 14214 specification. For higher blends, approvals varied; some manufacturers approved up to B100. Those broad descriptions are context, not a current approval for an individual vehicle.
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For a practical decision, treat the fuel section of the current manual as the starting point. It should identify the allowed blend and may add requirements that are just as important as the blend limit. A vehicle that is described generally as “diesel” is not necessarily approved for every fuel sold as a biodiesel blend. The vehicle’s exact instructions and the pump’s labeled product need to agree.
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How to check whether your diesel vehicle can run on biodiesel
- Identify the vehicle precisely. Write down the make, model, model year, engine and country or market where the vehicle was sold. If there are multiple engines or fuel-system versions, identify yours from the vehicle documents or by asking a dealer. A manual for a different market or model year may give different fuel instructions. Keep these details together before you search or call so that an answer for a similar vehicle is not mistaken for an answer for yours.
- Find the current owner’s manual. Look in the fuel, fuel quality or specifications section. Search the manual for “biodiesel,” “B5,” “B20” and “fuel requirements.” NREL directs owners to the current equipment owner’s manual for the applicable approval. Use the manual that applies to the vehicle’s model year and market, not just a search result, an older handbook or a document for a related trim.
- Record the maximum blend and every condition. Note the highest approved blend, the fuel standard required, and any directions for oil changes, filters, storage or low temperatures. Do not treat a blend number as permission to ignore the instructions attached to it. If the manual gives separate instructions for different blends or situations, keep each condition with the blend it applies to.
- Ask the manufacturer or dealer if the instructions are unclear. Give them the vehicle identification number (VIN), model year, engine and market. Ask what maximum biodiesel blend is approved for that specific vehicle and whether any operating or warranty conditions apply. EPA likewise advises checking with the vehicle manufacturer or warranty information. A VIN helps the manufacturer or dealer identify the precise configuration rather than relying only on a model name.
- Read the fuel-pump label before filling. Confirm that the blend offered does not exceed the limit in your vehicle’s manual. If the label or product description does not make the blend clear, ask the fuel supplier rather than guessing. The percentage on the pump describes the fuel, not the vehicle approval.
- Check the required fuel specification. Use the standard named in your manual, if one is specified. For U.S. examples, NREL refers to ASTM D6751 for biodiesel, while the 2015 Ram supplement specifies ASTM D7467 for B6–B20 blends. Requirements differ by vehicle and market; do not transfer one manufacturer’s specification to another vehicle. Check whether the manual refers to the biodiesel component, the finished blend, or both.
- Do not substitute raw oil for biodiesel. Raw vegetable oil and unprocessed waste cooking grease are not finished biodiesel. EPA’s archived fuel guidance distinguishes them from biodiesel; do not put them in the tank as a substitute for approved fuel.
Once you have found the applicable instructions, compare them with the label at the pump before buying fuel. If the manual permits up to B5 and the pump is marked B20, the blend exceeds the stated limit. If the manual allows B20 but requires particular fuel quality or operating practices, the blend number alone does not satisfy those conditions. If the manual is silent or ambiguous about a higher blend, silence is not a reason to assume approval.
What B5, B20 and the pump label mean
The number after the B indicates the biodiesel percentage in the blend. B5 contains up to 5% biodiesel; B20 is 20% biodiesel and 80% diesel. EPA lists B5 and B20 among common blends. The label tells you what is in the fuel, not whether your vehicle is approved to use it.
Match the pump’s blend to the maximum specified in your manual. If your manual permits only up to B5, B20 is above that limit. If it permits B20, follow any additional fuel-quality and operating conditions. If the manual does not discuss a higher blend, do not infer approval from another vehicle’s manual, a general biodiesel claim or the fact that the fuel is sold locally.
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The distinction matters because approval above B5 varies. NREL’s 2023 description of OEM approvals records a broad landscape rather than a universal B20 allowance. It does not establish what share of all diesel vehicles can use B20, nor does it tell you whether a particular vehicle can use it. A driver asking “Can I use B20 in my diesel truck?” needs to check the truck’s exact year, engine and market instructions, just as a car owner does.
Examples of how manufacturer instructions differ
These examples show why the exact manual matters. They describe particular documents and vehicles; they are not approvals for other models, years, engines or markets.
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| Manual example | Blend guidance in that document | What to take from it |
|---|---|---|
| 2015 Ram diesel supplement | Approves up to B20 for the specified pickup and chassis cab models, subject to stated requirements; blends above B20 are not approved for those vehicles. | The B20 limit comes with vehicle-specific requirements for matters including fuel quality, maintenance, storage, filters and low-temperature use. |
| 2021 Ford F-650/750 manual | For the specified vehicles, says fuels containing up to B20 may be used. | The manual also gives blend, service, storage and cold-weather directions. Follow that document rather than assuming its terms apply to another Ford diesel. |
| 2025 Hyundai owner manual | Discusses B7 and, in a separate context, B30 compatibility subject to conditions. | The language is market- and context-specific. Neither figure should be detached from the exact manual section and applied to another vehicle. |
The useful comparison is not simply “which brand allows the most biodiesel.” Compare the stated maximum blend alongside the model year, engine and market covered; the required fuel specification; maintenance and oil-change conditions; storage and temperature restrictions; and warranty language. A higher blend limit with conditions is not interchangeable with a lower limit that has different instructions.
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The examples also show why a number taken out of context can mislead. The Ram and Ford documents address specified vehicles and include additional operating directions. The Hyundai manual’s B7 and B30 discussion applies in different contexts and is market-specific. None of these examples should be used as a shortcut for identifying the approval of a different vehicle. Treat the manual’s full wording, including its scope and qualifications, as the decision point.
Read the conditions as part of the approval
A manual may allow a blend only if its fuel meets a stated specification or if maintenance is adjusted. Ram’s B6–B20 example, for instance, sets requirements for diesel and biodiesel quality and includes operational directions involving oil-change intervals, filtration, storage and low-temperature precautions. Ford’s cited manual also gives guidance on blends, service, storage and cold weather. These examples illustrate the kinds of conditions to look for; they are not universal requirements.
Make a short list while reading: the allowed blend, any named fuel standards, service changes, storage directions and temperature precautions. If a direction is written for a particular blend or circumstance, keep that limitation attached to it. Do not assume that a condition in one manufacturer’s supplement is a standard requirement for every diesel vehicle, or that a condition can be skipped because another manual does not mention it.
Fuel quality
Check whether the manual names a standard for biodiesel or a finished blend, and whether it separately specifies the diesel portion. Do not assume a blend is suitable just because it has the right B-number. The Ram supplement’s references to ASTM D6751 for biodiesel and ASTM D7467 for B6–B20 blends are specific to that document. Use the standards and fuel-quality directions for your own vehicle and market.
NREL’s 2023 Biodiesel Handling guide identifies ASTM D6751 and European EN 14214 in describing the B5 approvals reported for known on-road and off-road vehicle OEMs. That context does not allow an owner to choose either standard in place of the one specified by a vehicle manual. Different documents can address different parts of a fuel blend, and the applicable manual should determine which requirements matter for your vehicle.
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Maintenance and filters
Look for instructions that change an oil-change interval, require extra checks or address fuel filtration. Follow the schedule and procedure in the applicable manual; do not adopt a service interval or filter instruction from another make or model. If your manual requires a shorter interval or other adjustment for a particular blend or operating condition, that condition is part of the manufacturer’s stated guidance.
Do not assume that maintenance directions are optional details after approval. A blend may be permitted subject to a service schedule or filtration instruction, and the owner needs to follow the full set of directions. If the manual’s wording is unclear about when a condition applies, ask the manufacturer or dealer to explain it for the VIN and the blend you plan to use.
Storage and cold weather
Find any limits on storing biodiesel blends or using them in low temperatures. Cold-weather directions can be blend- and vehicle-specific, so avoid relying on a rule of thumb from another owner or a different manual. If you cannot find the applicable limit, ask the manufacturer or dealer with the VIN before using the higher blend.
Storage instructions matter too: a manual may say how to handle fuel under particular circumstances. Do not infer a storage period or temperature threshold when the instructions do not provide one. Ask for the applicable guidance instead of borrowing a number from a different vehicle’s manual.
Does biodiesel use void the warranty?
Blend approval and warranty coverage are related, but they are not the same question. NREL explains that warranties cover materials and workmanship, while fuel is an external operating condition. Federal law prohibits voiding a warranty solely because biodiesel was used; that does not require a manufacturer to cover damage directly attributed to unsuitable or poor-quality fuel.
Read the warranty terms and fuel instructions together. Keep the relevant manual and fuel records, and ask the manufacturer or dealer to clarify any uncertainty about an approved blend or a condition that could affect coverage. Do not treat a broad statement about biodiesel use as a promise that every fuel-related repair will be covered.
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Do not guess upward from B5, a different model’s approval or an online discussion. Contact the manufacturer or an authorized dealer and provide the VIN, model year, engine and market. Ask for a clear answer about the maximum blend and any requirements for fuel specification, maintenance, storage and cold weather. If the answer is verbal, ask where the applicable instruction appears in the manual or warranty materials, or request written confirmation.
Until you have an answer for a higher blend, stay within the limit clearly stated for your vehicle. If no limit is given, seek manufacturer guidance rather than interpreting silence as approval. When choosing fuel, the label and the vehicle’s instructions must agree: a pump offering B20 does not make B20 suitable for a vehicle approved only for B5.
If the vehicle is used in a different country from the one covered by a manual you found online, do not assume the same limit applies. The market is part of the identification check because manuals can contain market-specific language. Hyundai’s cited 2025 manual illustrates that guidance can vary by market and operating context; it is not a universal Hyundai approval. Ask for the document or confirmation that applies to your own vehicle’s market.
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- You have matched the manual to the exact model year, engine and market.
- You have found a stated maximum blend rather than relying on a general claim about diesel engines.
- The pump’s labeled blend is at or below that maximum.
- You have checked the fuel standards and every maintenance, storage and temperature condition that applies.
- If approval is unclear, you have asked the manufacturer or dealer using the VIN.
- The fuel is finished biodiesel blend, not raw vegetable oil or unprocessed grease.
If any answer is missing—especially the approval for a blend above B5—pause before filling with that blend and confirm the instructions for the exact vehicle. The safe decision is based on the manual, fuel label and stated operating conditions together.
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Frequently Asked Questions
Can my diesel car use biodiesel?
Check the current owner’s manual for the exact model year, engine and market. EPA says concentrations up to B5 are approved for safe operation in any diesel engine, but that general guidance does not establish approval for B20 or a higher blend in your particular car. Follow the vehicle’s stated limit and conditions.
Can I use B20 in my diesel truck?
Only if the manual for your exact truck configuration permits B20 and you meet its fuel-quality, service, storage and cold-weather requirements. Some specific manuals, including the cited 2015 Ram supplement and 2021 Ford F-650/750 manual, describe B20 use for specified vehicles. Their approvals do not apply automatically to other trucks.
How do I find the biodiesel limit for my vehicle?
Search the current owner’s manual under fuel, fuel quality or specifications for “biodiesel,” “B5” or “B20.” Record the maximum blend and all attached conditions. If the manual is unclear, contact the manufacturer or dealer with the VIN, model year, engine and market.
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Federal law prohibits voiding a warranty solely because biodiesel was used, but that does not mean every fuel-related repair must be covered. NREL explains that warranty coverage concerns materials and workmanship, while fuel is an external condition; damage attributed to unsuitable or poor-quality fuel may not be covered. Check the warranty and follow the vehicle’s fuel instructions.
Is raw vegetable oil the same as biodiesel?
No. Raw vegetable oil and unprocessed waste cooking grease are not finished biodiesel. EPA’s archived fuel guidance distinguishes these materials from biodiesel. Do not use raw oil or unprocessed grease as a substitute for a vehicle-approved fuel.
What if the manual does not mention B20?
Do not interpret silence as approval or assume another vehicle’s limit applies. Ask the manufacturer or dealer for the approved blend for your VIN and request clarification about fuel specifications and operating conditions. Until you have a clear answer, stay within the limit stated for your vehicle.
The Bottom Line
Use the blend limit and conditions in the current manual for your exact diesel vehicle, and compare them with the fuel-pump label before filling. If the manual does not clearly approve the blend you want—especially B20—confirm it with the manufacturer or dealer using the VIN. Do not substitute raw vegetable oil or unprocessed grease for finished biodiesel.
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