Quote:
Originally Posted by widebody911
Mythbusters did a segment on this. They took a mercedes diesel and did back to back tests, one with diesel fuel and one with used french fry oil - they didn't do any mods to the car other than rigging a system to meter the fuel. The french fry oil got slightly lower mileage, but it ran fine.
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That's part of the problem though... you can get just about ANY diesel to run on unheated vegetable oil. It'll work... but how well, and for how long?
Mercedes seem to handle vegetable oil really well, even with unheated 75/25 blends. Even then, you can kill them dead by getting water in the fuel or not filtering it well.