Have a BMW 320D m sport with rft's. Got a puncture late last night (lady driver alone on dark road) & drove home 40 miles at 30mph. Took car in to local BMW dealer this morning (another 5 miles) and told wheel rim is cracked in 3 places so i need new tyre and new wheel costing 1,200 euro. i thought it was safe to drive on the flat tyre ...... according to the BMW sales literature you can "drive for long distances on a flat tyre with their run flats. Any advice - do i have any case for BMW to replace the wheel do you think?