Sorry for bringing this thread back up I just wanted to clarify a couple things for people.

1: Sealing the cap is a good idea for reducing oil seepage into the rest of the air cleaner and I encourage everyone to do it. Not sure why there wasn't a type of gasket there from the factory.

2: How the separator functions? The separator works by having the walls of the unit cooled by the coldest available air source (the incoming air) so that the hot gasses and oil vapor will condense on the inside walls, and run down into the oil pan. Now I am against stuffing the unit with steel wool as it reduces the available COOL surface area, therefor reducing the amount of oil condensation, encouraging the vapors to blow through into the intake, and steel wool doesn't encourage draining so well. Now if you were somehow able to get an aluminum or copper type wool, the conductivity of the metal might negate that problem.

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1982 300D Silver/Blue 612000kms (Sold 2010) Now at 660000kms, original engine, original tranny.