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Discussion Starter · #1 · (Edited)
The intake manifold had oil on the bottom which dripped on the exhaust. Could not find the leak until I loosened the 2 bolts of the oil filler neck. It was loose enough in the main tube that I was able to move it around. I surmized this was the cause of blow-by. Replacing "O" ring on filler neck with a larger size eliminated this problem.
 

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Yes, I ran into this same problem in my '01 Aero. I wrapped it with some teflon tape to make a good seal until I could locate a slightly larger O ring. I think it might have shrank or flattened out since I did the PCV upgrade because I didn't remember it being loose then.
 
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