+1 - mine took a litre early on also but since then has hardly used any more. Checked with my dealer who asked the tech who works on the M csars and he said it is perfectly normal.
Just a pain not having a dipstick - had to have mine running on the driveway for about 10mins last time waiting for the electronic dipstick to take a reading.
Never before have I taken 20mins to top up the oil level on a car before
