I've had the A6 for about a month and it has had a vibration from the back during the first 5-10 minutes of driving at highway speed. Then tends to smooth out.

So today (about 0 degrees out here in MN) the vibration was so much that I pulled over and let some air out. I had checked air this morning to find that the pressure was all over the place. I filled the fronts to 35 and the rears to 41 as the door directed. Vibration was terrible and when the PSI was reduced it was still bad.

I then brought it into a Tires Plus to have them check that the wheel(s) were not bent and to balance. Turns out all four wheels needed balancing. Ranged from .30 to .75. Glad that the shop (not Tires Plus) that put the new tires on last month did such a good job balancing the wheels!

Cool thing was that the tech let me hang out while he worked so that I could inspect the car up on the lift. Everything looked real good, plus brakes are fairly new.

Seems real nice and smooth at this point. Had it up to 70 on the way home. I'll see how it is in the AM after freezing for another night, but so far so good.

With it being new to me, and the vibration seems to be gone, would a Road Force alignment still be worth it just to make sure that everything is top notch?

 

Don't be surprised if it rides a little rough for a few miles, until the tires warm up. Sitting overnight in cold weather, the tires "flatten" a little and hold that shape until they warm up and round out again.

 

Did you mean to say 41 for the fronts and 35 for the rears? Do you have rear engine?