This is off topic I guess...Being theAudi guy I am (have owned 5and I am only 31) My good buddy cal me up with some crazy Idea.... he wants to find an Audi TDI and put aWVO system in it...for those of you who have not jumped into the bio fuel arena that is WVO or "Waste Veg. Oil" He has been looking at VWs but thought it would be more classy to have an Audi..He really is looking for a Q as well... Now my thinking is ... where... I have seen two or three late model A4s that are diesel so what is the reality of finding a mod to late 90's A4Q TDI?