I have a 2004 A6 4.2 which now has 10K original miles. I am the first owner and the only driver. The vehicle has been back & forth to the dealer 4 or 5 times over the past 10 months trying to correct a mild vibration in the car. I feel this "chatter" in the steering wheel, however, it can also be felt throughout the entire car. We have changed steering rack, new tires, front left wheel bearing, many tire balances. Does anyone have similar experiences? Audi sent a technical engineer to drive the car and he claims that this is normal for my car and it is within Audi specs (although they can't give me these specs). Also, Audi now states that they are not going to spend any more money trying to fix this problem under warranty.