ptfive 
2012 BMW 5 Series Sedan 550i xDrive 4dr Sedan AWD (4.4L 8cyl Turbo 8A)
Run Flat Tires will Fail
 2012 BMW 550, low miles but already 5 run flat tires have failed on me. Sidewalls splitting - effectively destroying tire. The left front tire has been replaced THREE times. Unfortunately BMW does not stock these tires, so when it falls apart your car will be in shop 5-7 days while they order new tire. Motorwerks in Minneapolis does not have any loaner cars when this happens, so consider your BMW a $70,000 bus pass. YOU WILL BE TAKING THE BUS A LOT. Not a fan of run flats - what are you supposed to do when the sidewall splits and you are 1000 miles from home in the middle-of-nowhere? . Give me a spare BMW!!!