Originally Posted by 335isWhite
Numbers doesn't sound right, here is the number for 335i according to the owner manual:
Engine with oil filter renewal US quarts/liters approx. 6.9/6.5 BMW High Performance,
So 335is with additional oil cooler should take more oil (even more than 6.9 quarts).
yes, I know it has an additional oil cooler, still, 6.8 quarts are enough check this thread