BMW oil filter housing gasket.

So the Ci has been leakin oil from the side of the block from quite some time. I decided I had best fix it now before I end up moving into a shitty garage-less apartment.
The gasket itself is an o-ring style gasket that goes between the engine block and the oil filter housing. Getting parts off is the hardest part!
I discovered some rather strange wear on the pressure valve when I got the block off. Not sure what to think of it yet. Probably going to throw it back on like so! :)