I have read that a blend of biodiesel if good for the motor. It is said to help clean injectors and lubricate as well. It appears that if you asked four people their thoughts on biodiesel, you would get fifteen different answers. I run a blend in my 6.0 and no issues. I feel that any fuel we can produce domestically, we should all be willing to pay a premium for it. IMO. I will add that the biodiesel I'm running is soydiesel made from soybeans.