Biodiesel and biodiesel blends can be used in any diesel engine. Cold temperatures can be a problem for high-percentage blends of biodiesel. Pure biodiesel made from soybean oil can clog fuel filters if the temperature drops below 28 degrees F. Biodiesel can be blended with fossil diesel during cold weather. Because biodiesel is a strong solvent, it will probably loosen debris in pipes and tanks, clogging filters initially. Remedy this problem by changing filters soon after first use. Sometimes rubber hoses and gaskets on older vehicles don’t hold up well with pure biodiesel. Pre-1991 vehicles should be monitored for hose degradation or seal weepage. If these occur, the hoses and seals should be replaced with viton-based parts. Engine warranties are not affected by the use of biodiesel, although dealers are frequently confused on this point. Manufacturers' warranty statements only cover the parts and assembly of the engines, and never cover problems caused by the fuel, regardless of whether the fuel is petroleum-based diesel or biodiesel. Questions about liability for damages caused by a specific fuel should be addressed to the fuel supplier. See the National Biodiesel Board's Standards and Warranties page for more information. For more information about using biodiesel, see Using Biodiesel as a Fuel; and Biodiesel Fuel Education Program.

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