I have a 98 Audi A6 that I like enough to thinkabout an engine transplant instead of buying a VW TDI (not to mention the Audi is much more comfortable!!). I want to do this because I will be producing my own biodiesel, so my fuel will be much cheaper (to a tune of $2,000+ per year). I don't know if it is possible to do a transplant in this car, but what engines are suitable for this switch? Is the 2.7TT Diesel version that I have seen available in Austraila a good choice? What engine would you drop in? BTW it is a quattro.