Originally Posted by TrackRat
ALL engines consume oil in normal operation. Some engines consume more than others. Turbo engines run hotter and have more oil vapor for the PCV system to process, which means it is sucked thru the intake system and burned.
Normal engine oil consumption is 1 qt. in 2,000-5,000 miles. You will definitely need to add oil between BMW specified OCIs and this is normal. If you change the oil at 5K-7.5K you may or may not need to add oil but the engine will still consume some oil.
This sounds pretty definitive from a knowlegeable guy. Lets see how many more answers we can get that are virtually the same..........