It does work in the old type engines for sure. Its been on Brainiac and Mythbusters on TV. I know someone who runs a Rover 600 on it.However I'm fairly sure it would ruin a modern diesel. I heard of a local builder who put heating oil in his PUG Hdi and had a nasty result. Something to do with cetane ratings and ignition points of the fuel I think.
Someone will tell us in a while when the threads a bit older
I think he means converting straight vegetable oil into biodiesel, its done by using methanol and various other chemical things to lower the viscosity to something like white diesel. Then the bio could be used with no engine modifications. The two methods most used to run on SVO is either mix it with white diesel, to thin it out, or to start with SVO and make it into 'proper' bio. Some 1970s Land Rover diesels have been known to run on 75% SVO for summer off-roading..I thought biodiesel was ok straight form the pump, no conversion necessary