Below is a list of diesel vehicle manufacturers and their latest warrantee information. All warrantees are based on the biodiesel being ASTM D 6751 certified. Of course, if you want to use a higher blend than your engine manufacturer recommends, feel free to do so... just realize that they won't warrantee your car.
At this point, almost everyone approves at least a b5 (5% bio, 95% diesel) blend.
Cummins - Neither approves nor disapproves biodiesel use in the engine, but like other fuels, will not warrantee an engine that dies because of any bad fuel (be it bio, diesel, gasoline, etc).
Detroit Diesel - Detroit Diesel Corporation highly recommends biodiesel fuels made from soybean or rapeseed oil through the proper transesterification reaction process. Other feedstock source of biodiesel fuels such as animal fat and used cooking oils are not recommended by DDC. Biodiesel fuels meeting ASTM D 6751 specification, prior to blending can be mixed up to 5%maximum by volume in petroleum diesel fuel. The resulting mixture must meet the fuel properties listed in Table 5-1 and ASTM D 975 specification. Failures attributed to the use of biodiesel fuel will not be covered by Detroit Diesel product warranty. Also, any engine performance problem related to the use of biodiesel fuel would not be recognized nor considered DDC's responsibility
Ford - Fuels containing no more than 5% biodiesel may be used in Ford diesel powered vehicles.
Consistent with WWFC (World-Wide Fuel Charter) category 1-3, “Fatty Acid Methyl Esters
(FAME) used in commercial fuel must meet both the EN 14214 and ASTM D 6751
specifications”.
GM - Beginning with the January 2004 production cycle, GM’s Duramax Diesel engines will be approved for B5, a blend of 5% biodiesel fuel, giving fleets another choice for fueling and for complying with state and federal requirements.
International - Warrantees up to 5% biodiesel blend that meet the ASTM D975 standard.
Mercedes-Benz - Mercedes-Benz USA now approves the use of B5 biodiesel (standard diesel with a maximum 5% biodiesel content) in all Common Rail Injection Diesel "CDI-engines.
Nissan Diesel (no passenger vehicles) - Approves up to 5% biodiesel use.
Volkswagen - Approves up to 5% biodiesel use.
Volvo - Approves up to 5% biodiesel use.
