This May 1st Minnesota has mandated all diesel fuel to contain at minimum 5% biodiesel. In 2012 all diesel sold in Minnesota must contain at least 10% biodiesel. The owners manual for our 2008 M-Class CDI states that the maximum biodiesel content allowable is 5% and that anything above that percentage mixture is not allowed, will void the warranty and will damage the engine.

Are other states mandating the same percentages and what is a diesel owner to do? Of course one obvious thing is to not buy diesel in Minnesota but that may be quite impractical.

Jim W.