Well, I gots a few issues with a new to me 1997 960 sedan, 105K.

Latest- an oil leak!

My indy volvo mechanic says it is not rear main seal or any gasket or a clogged flame trap, but that the "sump" is the leak source, we have not yanked it yet, but have isolated it as the source, so not sure if it is cracked or what....as you know it lies down behind the alternator, which interestingly, according to him, this car had an 850 model unit, as it chewed up the new serpentine belt installed due to mis-alignment. Hhhmmm....Maybe an accident occured was suggested, and of course the previous owner has no clue of anyhting and that "the car ran fine for me for many years..riiiight!"

So guys, what dos this "oil sump unit" do and why?
Where does the oil come from and go to?
Why would it be leaking (cracked)?
How much is a new repalcement unit?

Any reply will be greatlt appreciated! Mike

What your describing is commonly referred to as the PCV box that sits on the driver's side front of the engine block. There is an 'O' ring and a small hose/tube on the back side of the box that connects to two openings in the block. There is also a long hose that connects to another opening in the block just above the oil pan at the rear of the block under the starter. At the top of this unit is yet another hose that attaches to the flame trap on top of the intake manifold. I have a picture of this that I can send you via e-mail if you like.

DEWFPO
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1998 S90 071,245 and 1995 964 154,100