another clue??
I pulled the Air Distribution Piece that sits on the intake manifold - part of CCV system. A little bit of "mayo", but when I sprayed it out with compressed air WATER came out, including the top return? pipe.
I ordered a new CCV system. I plan to pull out, up to, and including the throttle body, clean and check for leaks and since it was noted to me that the CCV system can influence just one bank - I will replace it. I contemplated on the the "traditional PVC" cheat, but I would like to keep the BMW original to the engineers.

THANKS

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2004, X5, 3.0, 202k+