hello everyone. i am new to this forum and have a question..i have a 1987 740 turbo that is leaking oil...it is coming from what i would call the oil filter mount but im sure thats not what it is called...it is the piece that the oil filter goes onto. it is leaking from the forward most part of the "mount". there is a large bolt that goes through it into the engine block.i need to know what that part is called and if there is some kind of gasket or seal behind it that i can gert to stop the leak...thanx for any and all help

 

That is the oil cooler.
Yes there is a couple of o-rings between there.