Why is red diesel illegal? Red diesel is illegal for on-road vehicles because it's not taxed. Federal and state governments have strict standards in place about its use in on-road engines. Distributors and fuel retailers cannot knowingly supply on-road vehicles with this type of fuel.

Why can't people use red diesel?

As red diesel is a rebated fuel, it's taxed at a lower rate than the standard white diesel available at petrol filling stations up and down the country. It's illegal to use red diesel in vehicles on public roads (although there are some exceptions such as when gritting roads).

Can red diesel damage your engine?

Can Red Diesel Damage Your Engine? No, it can't. It's the same as on-road diesel except for the dye. If you have a diesel engine, it can run on farm fuel.