On the 300SD there was lots of oil blowing down the tube (reasonable amount) and the oil collecter was picking it up however the air that was leaving this unit was drenching my air filter in oil.
Some brake clean, clear silicone, and Avaiation Sealent (brown goo) fixed that problem right up and now my air cleaner stays as colorful as new I would just seal up your CCV system joints real well and call it good...Let the oil collection thingy in the air filter do the rest