Also wondering if your or others have tried stainless steel brake lines in an RS6. A total brake upgrade is out of the question due to expense, at least for me.

"I agree a total uppgrade is to expensive!

I have stainless steel lines(cost 185 eur) and dot 5. Cant say its a very big diffrens whit steel lines. Well a small diffrent feel in the pedal it is. My guess is its makes more of a diffrens changing some old bad rubber lines on an old car to new steel lines then i think its more of an aaha feling. Anyway it feels god to have a litel extra on a hevy car like this.