It's not clear if your engine actually burnt more oil or not unless the computer records oil levels over time and the BMW tech was able to retrieve that info. It is possible that your car came off the factory with less oil than it should have had. I think this happened to someone else here, a member from the UK?
P.S. Please stop trying to insult people for the type of car they drive. If not, bear the consequences, some of which were pretty darn hilarious actually.