It looks like most of the Audi 4000s in the US has got 5-cyl engines. Those models are almost non-existent here i Norway/Europe, all the Audi 80s (from the times of euro 80/100 was US 4000/5000) has got the 1.8 90hp or the 2.0 115hp I4 engines.. Have your 4000s got I5 engines? E. Spangen