Does crankcase ventilation affect 83 240D oil leakage through my rear seal?
I have a small puddle where I have been parking the car. When I rebuilt the engine, I took the bottom housing that mates to the bottom of the block(the one that the oil pan mounts to...) from an earlier engine, becuase it was cleaner.
SOMEHOW I was dumb and didn't notice that mine had a hole for the Crankcase ventilation line/tube that runs from the Crankcase hosuing up about 1 foot into the Black foam covered cylindrical tank that feeds into the intake manifold.
I am assuming that this is the real reason my rear oil seal is leaking. As soon as the weather gets warmer, I was thinking of removing my pan and drilling through the bottom Crankcase housing and installing a Crankcase breather line--will this work?

if it's really crankcase pressure, pull the oil cap off and see how much effort it is to keep your hand over the oil fill. if it wants to blow your hand off, you might be right. i am not famliar with the ins and outs of 616 crankcase venting, but i've seen gas volvos do the same thing when THEY don't breathe right, pass oil past the ft and rr seals. good luck, chuck.