Quick question for you guys.

I'm getting a vibration during the first 5-10 minutes of driving and then it goes away. When I purchased the car a few weeks ago, it had one new tire on the back left and 3 fairly worn elsewhere. The dealer put on the single new tire when it was traded in. Vibration does feel like it is from the back.

I've already replaced the tires with new all around. Could this be from the non matching tire? Quattro figuring out that the tires are now correct?

 

It could be the tires, the balance on the tires, your control arms, brake rotors, tie rod ends, bushings, CV joints, etc., etc. My car vibrates and I have replaced all of the above.

Good luck,

Bob

 

It's not good practice to have different size tires on an Audi due to quattro. It would cause more of a strain on the differentials and transfer case than vibration. Vibration is typically due to out of balance tires. One other factor, in cold weather, is that a vehicle parked for a while may develop very slight flat spots which may take a few miles of driving to warm up and go away.

 

+1 for balancing the tires. DOuble check what you are saying about it only happening the first 5-10 minutes of driving. Make sure it is not just at a certain speed.

 

I'll take the advice to do some more checking. It does go away after a few minutes and it has been under 20 degrees at night since I got the car.

I'll be pissed if the tires aren't balanced as they were just installed.

 

If a tire loses it's roundness due to prolong period of inactivity under load (weight).
Takes some time of driving to regain the shape. Could be a sign of internal separation or damage.
just my 2c

 

Could also be moisture in the air in the tires, which is condensing and freezing in the cold weather and causing an out of balance condition, until the air in the tires warms up from driving and remelts the moisture. Rare but it has been known to happen.

Tires that are just out of balance don't rebalance themselves after 15 minutes of driving. Cheap tires can take a set over night.