Well, I'm new to the realm of diesels really, but I would recommend doing what I did. Remove CAC
pipe leading to the intake and take a look-see. I did that and the inside of the pipe was coated with oil! In fact, when I then took the other side off the CAC
about half an ounce or so poured out of the thing. This tells me the inside of the CAC
is coated in it too. Like you said, I think the efficiency is now reduced.
When I have the whole top end basically pulled apart for some mods I'm doing I'm going to pull the CAC
and give it a good simple green wash to get as much oil out of it as possible. For the future, I built my own CCV
filter kit out of some 2" PVC, some end caps, fittings, stainless steel wool and 1" hose. Total cost was about $25. Granted, I won't know just how well it is working until after I get the CAC
tubes cleaned out, but the intake side of the turbo looks much cleaner now!