What are possible causes for multiple rear tire flats for a 2003 BMW 330 ci convertible?
I have had several rear tires go flat and fall apart within just a few months. The tires look as if a knife were inserted on the interior and run around the entire tire.
I've been taking the car back to different Firestone locations to have them replaced (under warranty) but they each give me a different potential cause (from a I ran over a nail and when the tire expanded with the hot weather the nail caused the tire to fall apart to a bent rim). With a few exceptions for occasional weekend trips, throughout this year I drive the car just a few days a week and put maybe 100 miles a week on it. I have about 96,000 miles on the car.
I am flummoxed by this problem. Any ideas?