Biodiesel (methyl or ethyl ester of plant oils or animal fats) is a new fuel which is being tested under a wide range of conditions including both neat and blended with petrodiesel. Users of this fuel should be aware that the fuel must meet ASTM D6751. According to our analysis, engine manufacturers generally neither approve or disapprove of biodiesel. They state their warranties are for materials and workmanship. Users of this fuel or any fuel not meeting manufacturers’ published fuel specification requirements assume warranty liability for failure of components or emissions certification traceable to the fuel. Non-fuel related warranty issues are not affected by the use of biodiesel. Some engine manufacturers recommend the use of 5% biodiesel or less.
Biodiesel is not exempt from road tax in most states and localities. If you use biodiesel in your vehicle and the distributor has not assessed the appropriate federal and local tax, you are responsible for reporting the tax liability to the proper federal, state and local agencies. If in doubt, contact your state, local, or federal tax board.