I have the DIY Husky oil/water separator as a catch can on the PCV side. I opened up the manifold cover to find that there's still oil accumulated in the top manifold. I thought the catch can was supposed to reduce or eliminate this? Most of the oil is on the throttle body side. Could it be coming from the intake tube? Maybe a bad PCV?







Notice the oil pooled up under the bolt

 

I’m curious if you ever solved this? I also have a j-series V-6 in an 03 CL-S and have the same problem. I was thinking of installing a catch can but sounds like it did nothing for you, ever find out why? Not only oil, but I have excessive carbon deposits in that area as well.

 

tap the other side as well, not just the pcv side

 

and also make sure your EGR isn't spitting oil into the intake also.

 

I don’t think there is a solution to this area near the throttle body. The cover will have to be removed to clean this area. I think the oil is pulled from underneath the area near the throttle body. The catch can catches the oil from the crankcase on the passenger side.

By the way, the vehicle now has a Mishimoto baffled oil catch can and my brother now owns the vehicle.

 

Unless you also bypass the EGR valve, there will still be oil. Catch can on the passenger side does reduce it but not totally eliminate it.