IF you drive it hard... you can use a one liter of oil every 3K kms or so. This is normal. Change you oil often, as many do not believe in BMW's long OCI plan. Changing your oil every 5K to 8K kms is a good idea.
Also... doing lots of short trips where the oil doesn't warm up totally can make the oil level sensor not read correctly. This is another reason why I prefer to do more frequent oil changes as I don't fully trust that BC.
