We are returning from a summer road trip and stopped near the Highland Park service and super charger site. Since we have had the car for about 18 months and have about 13,000 miles, I asked the service center to do the annual maintenance. They found the steel belts protruding from the two rear wheels. There is no warranty on the tires and I was told this happens due to the torque on the rear wheels. I was quoted $491.67 to replace the tires with no warranty on the new tires. Has anyone else experienced this problem? I am not an aggressive driver and tire failure at 13K miles seems unusual to me.