I've had a 2001 A6 Avant since last June and noticed the vibration on about the third day on a long highway trip. Talked to the dealer and they said "flat spots" on tires. Did lots of reading about the issue since then and it seems the problem goes a lot deeper than flat spots on the tires. Most seem to think balancing and road force adjustments are the cure while others contend this is the way the beast runs and Audi will do nothing to fix it. I went all out and got a new set of winter wheels and tires and the vibration was even worse than before. I'm not going to waste any more time or money trying to get to the bottom of it as obviously there is no real and long term solution. For an Audi tech to say that performance is within specs means they have given up on it as well.
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