First step in trying to plug this slightly leaky BMW M20B28.
Removed the oil filter and oil pressure switch housing.
Replaced the large gasket seal on the back and cleaned the housing up. A lot of crusty stuff in here.
The metal gasket washer on the bolt and the very perished rubber gasket in the centre of the bolt.
The pressure switch gasket I changed a few years back, so left that in place.
