Originally Posted by compubert
When I put my series II back together the online community I was researching said some was from the oil galleries not being sealed with thread sealer too? I know I used thread sealer on mine when I rebuilt, have yet to see any and I just pulled it back apart to check it all several months back. I also replaced the UIM with the newer Dorman part and the PVC valve was supposedly a newer revision to. Seems to be very little oil there on inspection. Thanks guys! I hope that helps too.... Bert.
Are you talking about the lower intake manifolds bolts?
If so , and you don't use thread sealant on them, then yes some of the oil could be from the oil wicking up those bolts, but the majority is from the PCV breather tube.
I have not heard of any updated PCV Valves for this motor, I have heard of the updated/reduced diameter EGR Stove Pipe, this is replaced to keep the UIM Gasket from warping the area of the coolant ports that pass coolant into the throttle body, if they warp it can cause coolant to leak.