how often you had to fill up oil within the first 5900km?
I am now at 4500 miles (which is around 7200km) and I had to fill up oil already 4 times. I might have the same problem with the engine. Do you probably have the report your BMW dealer sent to the BMW AG?
According your initial post, you got your car mid september? I got mine end of October (didn't order it, saw the car at the dealership and signed the contract the same day, fell in love with the car immediately). Considering the transportation time to US, our engines might be from the same production line/month?
how long did it take them to change the engine?