Jan 
2009 BMW 3 Series Sedan 328i 4dr Sedan (3.0L 6cyl 6M)
Run flat tires
 This is the first BMW I have owned. Love the car. Overall I am very pleased. I have kept the tires rotated every 5,000 miles. First time I had tires rotated the car was out of balance. The car now has 17,000 miles on it and there is a terrible roaring noisy coming from the tires. I already need new tires. No mountain driving just open road. Talked with service department and all they had to say was "these tires don't last as long". on the sport package. Had I known this I would not have purchased the car. I can't afford to purchase new tires every 18 months or so.