grease powered diesel Audi's?

[auditude at get.net]

Has anyone heard of anyone converting an Audi diesel car over to run off of
vegetable oil (used or new)?

The idea of either an Audi, VW, or MBZ with this ability interests me.  Maybe
using some old turbo diesel 5 cylinder parts or the whole motor in a more
modern Audi?  Wouldn't that be special.

Some links, no affiliation:

http://www.greasecar.com
http://www.greasel.com

Ken