I heard that a lot of the older VW's could run on all sorts of fuel. Look into various types of Alcohol as opposed to oils. The internal copmbustion systems of a gas and oil based fueled vehicle is very different. Just make sure that the fuel lines and filters and pumps, pretty much anything that has a plastic or rubber seal can handle the chemical. However please do a lot of research before you try anything. there a lot of "old wives tales" that may lead you into danger. So please be very careful. I'll ask around.

Oh yea there is a new breed of car running on ethenal. corn Fuel. I think thats an alcohal based fuel?

Check out Howstuffworks.com to get an Idea of how the gas and diesel engines differ.

Good luck
Jeremy

in order to do this you'll need to drop a diesel engine into your VW Bug. And that's gonna be a bit of work. if you aren't a mechanic and/or fabricator/tinkerer you'll want to be rich as you'll be paying someone a lot to pull this off. if you are a tinkerer/mechanic/fabricator you'll be burning a lot of hours figuring out what engine to put into the car, how to make it work with your existing transmission (or finding and fitting a donor transmission) and then burning more hours doing the installation.

i think you'd be better off figuring out how to run a VW Bug using ethanol, methane or propane.