 My review somehow incorrectly stated the miles on my X3. The engine valve issue started at 6K, Not 60K as it states. And the car only has 11K,Not 110K as the reviews states, and yes it has been in the shop 5 times in a year and a half. The followup to my last review: After being in the shop for the 5th time BMW thinks the valve slam/tapping is normal! you should hear this especially during a cold start...it sounds like crap, no kidding it slams and thumps like crazy, and this was AFTER the cylinder head replacement! the sound comes and goes still! BMW WILL NOT DO MUCH FOR YOU AFTER THESE ATTEMPTS TO FIX A DEFECTIVE ENGINE ACCEPT TELL YOU THAT THE SOUND IS NORMAL!! BE WARNED FUTURE BMW BUYERS