With the rising interest in biodiesel and the increasing popularity of biodiesel-fueled vehicles (as we reported last Tuesday, July 22nd), consumers need to know how they can use the green fuel and still keep their manufacturer’s warranty.

Recently, biodiesel received ASTM approval for meeting standards for fuel use. That means that any biodiesel that meets that standard is as safe as regular diesel fuel. But some auto manufacturers and dealers are being a little hesitant in giving biodiesel a thumbs up for use. This story from the gas2.0.org web site has tips from the Northwest Biofuels Association to make sure that those car makers will honor their warranties, even if you use biodiesel:

* Whether or not a biodiesel blend is “recommended” by your automaker is separate from the question of whether the use of biodiesel affects engine warranty coverage. Make sure you know exactly what your automaker specifies.
* Because vehicle warranties only cover parts and workmanship, fuel is not covered under any vehicle warranty.
* Conversely, if consumers that use biodiesel have an engine failure unrelated to the use of biodiesel and the cause is found to be faulty parts or workmanship, then the failure would be covered by the warranty.
* If a customer brings in a vehicle that has used biodiesel and the customer is told that the warranty is voided solely because the customer is using biodiesel, this violates the Magnuson-Moss Warranty Act.
* A vehicle’s warranty cannot be voided solely due to the use of biodiesel.

The association included the tips with a letter written in collaboration with Oregon auto dealers and Oregonian biodiesel distributors.