Makes sure any light components that condense and are a liquid get knocked out or caught prior to entering the intake. This along with cleaning the egr circuit is thought to help improve the chances of avoiding a blown head gasket. I had the OCC installed on our 2010 for 30k miles and I did catch 8 ounces of “spooge” in that time. Now with thengine running less and kicking on at freeway speeds, I’m thinking it is prudent. But open to ideas .
The Positive Crankcase Ventilation system (PCV) tends to dump oil/water/gas oleo into the intake manifold. If you look down through the throttle throat and see a glistening reflection, that'll be it. Removing the throttle body will afford a much better look. An Oil Catch Can, aka Oil-Air Separator, is patched into the hose between PCV valve and intake manifold, with the object of trapping the vapor before it it gets to the intake manifold.
