About a month ago one of my rear tires failed on my 95 540. When I removed the wheel I noticed my tires were coned < on the inside. I just brought my car to have a wheel balance and was told by the mechanic that there are no adjustments to balance out the rear wheels, but he could tell that the rear whell needed a balance.

My car is a 95 540 with 165,000 miles riding on 18in BBS wheels. I have had this car for the last 65,000 miles. This is the 3rd set of tires, and I never had this problem before. Is there a known problem that goes wrong on E34's, is my suspension shot? should I just bring it to a BMW shop and get raped on the price to get it fixed?