When Rudolph Diesel debuted his namesake engine at the 1900 World’s Fair, he ran it on straight peanut oil. The modern diesel engine runs the same way with a few modifications: a booster pump, a heated filter, a heat exchanger, and a few extra hoses. Lovecraft Bio Fuels, based in L.A. and Portland, Oregon, sells these do-it-yourself kits, and for another $400 or so, will convert your car while you wait. Once complete, your diesel will run on used fryer oil scavenged from restaurants. For operating at colder temperatures, Lovecraft recommends adding an injection line heater, such as those offered at fattywagons.com, and an in-line heater, like those at planetdrive.com. Or if you live where it stays below freezing for extended periods, consider a two-tank system, which lets you start the car with regular diesel and switch to veggie once it’s warm. While emissions figures for waste veggie oil (WVO) are not readily available, mainly because different oils produce different results, WVO does, in fact, produce CO2. However, it’s a closed cycle—meaning the plants used to make the oil consume enough CO2 in their lifespan to offset the car’s emissions. It also helps that you are running your car on something that will sit in a landfill or be rendered into pig feed. Plus no country has ever been invaded over their reserves of burnt fryer oil.

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