How much gasoline can be added to a diesel auto's fuel tank without causing problems. I've heard the ratio can be as high as 70 percent diesel and 30 percent gasoline?

Answer 1

Incorrect on both accounts. The distillates in diesel are different than gasoline, in that they have different ignition points and cetane ratings. Because of this, adding gasoline to diesel will inhibit the ignition in the diesel engine, just as adding diesel to a gasoline engine will cause the fuel to ignite too quickly. In general, never mix the two. You can add diesel-specific additives to diesel, but gasoline is never recommended. More info: http://www.turbodieselregister.com/mixing_gasoline_and_diesel.htm