Quote Originally Posted by romeox929
I don't know when they started producing m50's for 525's, but I'm positive I have a M50.
OK, you're right (of course - it's your car) The last of the M20's was produced in August 1990. So I assume that yours was built post September '90.

And sure enough yours does apparently have a paper gasket rather than the profile gasket (also shown in the below drawing). I would definitely use some permagasket compound or something similar.

http://www.realoem.com/bmw/showparts...03&hg=11&fg=35