On May 31, I took delivery of a new '08 535xi sport wagon. On the way home, it was a little rough riding and I just thought this was its nature. Well, 2,000 miles later I discovered that the cold tire pressure was 48 psi in every tire. Recommended was 33 front and 41 back. My first mistake was trusting my dealer to check something as basic as tire pressure. My second mistake was not checking before 2,000 miles. I can only imagine what the tire pressure was on a 90 degree day on the interstate. Do you think that I could have damaged or affected the tires or the cars suspension by driving with these pressures? By the way, the dealer was Midwestern BMW in Dublin, OH.