Hello and welcome to JustAnswer BMW,My name is XXXXX XXXXX it will be my pleasure to assist you today.
Can I please have the last 7 digits of the vin to verify which engine you have?
Check the timing cover and oil filter housing gasket. In rare cases the head gasket can leak.
Best thing to do will be to thuroughly clean the engine and then wait for the leak to re-appear to pinpoint its source.
I hope that is helpful, please let me know if you have further questions, or if I can clarify anything for you.
It has been my pleasure to help today and I wish you the best of luck with the vehicle.
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