A friend of mine told me yesterday that a friend of his showed up at his house last week driving a '92 diesel car which he was running on vegetable oil. He said he was buying the vegetable oil in Lidl and using it without having converted his engine in any way. Unfortuantely my friend didn't get any more specifics, like make of car, how long he'd been doing it, etc.
Now I thought this was pure BS when I heard it but having Googled around the net today I've found lots of websites talking about how to do it. But not knowing anything about the mechanical side of motor cars I can't tell how authentic these sites are.
So, my question is, has anyone else tried or known someone who tried this? Does it really work?