At 72k mi on my 91 200q, the timing belt was cracked every 3/16th inch all the way across and 1/2 way through - I do not believe it would have made 90k. Of course I discovered this after just redlining the 1st 3 gears :-) - I feel lucky. mike miller 91 200q > but I > thought the consensus on the list was that the Audi 100/A6/S4/S6 timing > belts were good until about 90K.