Originally Posted by Josh1a1h
Very helpful response! Many thanks!
So does the whole oil cooler housing need replacing or just a gasket once again?
No, just the gasket needs to be changed. Do you have a factory oil cooler or not? If you DO, then you will need 2 gaskets. WITHOUT the cooler, there is just 1.
With cooler, numbers 4 and 5: http://realoem.com/bmw/showparts.do?...71&hg=11&fg=30
Without cooler, number 4 only: http://realoem.com/bmw/showparts.do?...67&hg=11&fg=30
Obviously, you need to verify this is where your leak is coming from. It's the most common one I see on N54's, though.