I have a 2003 XC70, 30K miles, tires have been rotated and have even wear.
Car is vibration free up to 78 to 80mph. It then (sometimes) has a front end vibration one can feel and see in the steering wheel(feels like a normal wheel unbalance). The vibration occurs about 30% of the time when approaching 80, other times it is absolutly smooth at that speed. It is not road surface dependent. Once the vibration begins, going slightly faster does not change the condition. The problem comes and goes on a long trip. I will have the balance of the front wheels checked, but it doesn't make sense that an unbalance condition would come and go. Can the all wheel drive system create this condition??? I do plan to talk to the dealership mechanic, but would like any feed back or 1st hand knowledge other xc owners might have.