he said lifetime fill. lifetime fill trans do not take atf they take a different oil which is much more expensive If his trans has never been changed then it should not be a lifetime trans but if it has then it will be a LT fill but Im sure you knew that right? If you use atf in a LT trans then you will destroy the trans. I would hate to see some poor guy ruin his trans because you dont have your facts straight just because you own a bmw doesnt make you an expert maybe you should just stick to driving your car