Great explanation, thanks - and a relatively simple solution to your issue!

My N62B48 engine has a similar smoking issue and likewise, this occurs not at startup but only after periods of extended idling, such as in traffic, etc.

The CCV parts listing for the 4.8 engine (see attached pdf) shows the valve (#4) and tube assy (#1) on back of cylinder head are either deleted from, or not applicable to this engine model, leaving just two pipes there (Item Nos. 2 & 3).
So I'm a little unsure of which CCV system part(s) I should be removing, replacing and/or cleaning on this engine.

Any advice would be appreciated.

Attached Images

N62B48_CCV instln.pdf (56.9 KB, 957 views)

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