I sold my Audi 100 quattro to my brother 2.5 years ago.
It has done 170k+ miles, the only bushes that have been replaced are the outer front arm bushes(twice) and the inner arm bushes, and 2 rear drop links(does that count?)
The rear anti roll bar bushes are a bit limp, but that's about it.
Anyway, i thought you didn't like A8's?