Can unaltered vegetable oil be used in a diesel engine?
This is not our recommendation, however, biodiesel is made from a base stock of vegetable oil and requires no alterations to your vehicle. It is possible to run a diesel vehicle on straight, unaltered, vegetable oil, but a few minor alterations are necessary. Conversion information is available in “From the Fryer to the Fuel Tank: The Complete Guide to Using Vegetable Oil as an Alternative Fuel” by Joshua Tickell (Tickell Energy Consulting, 2000).