Biodiesel is diesel fuel made from vegetable oils, animal fats, or recycled restaurant greases. It's safe, biodegradable, and produces less air pollutants than petroleum-based diesel.
Biodiesel can be used in its pure form (B100) or blended with petroleum diesel. Common blends include B2 (2% biodiesel), B5, and B20.
Most automakers approve blends up to B5. Some approve blends up to B20. Check with your owner’s manual or automaker to determine the right blend for your vehicle. Using the wrong blend could damage your engine and/or void the manufacturer's warranty.
Biodiesel tends to cost more than petroleum diesel, and prices vary across the country. View AFDC's Alternative Fuel Station Locator to find any of over 900 service stations selling biodiesel near you.
More on biodisel from DOE's Alternative Fuels Data Center (AFDC):