Thanks Ainarssems,
I’m dreading taking off the inlet manifold again... so just want to diagnose as best I can before taking things off again.
In thinking about the high vacuum I’m getting at idle where I cannot even remove the oil cover - any chance you can check your oil cap and let me know if it is easy to remove at idle?
I’m considering that I may have a defective PCV/Crankcase breather-oil separator valve. This would actually make some sense as it is located at the back of the engine near bank-4.
Thanks,
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Present cars
Daily driver: BMW e65 730d
Batmobile: 2006 S8, D3, 4E 5.2L V10 BSM with (loud) Miltek SS exhaust, Carbon Fibre trim, Alcantara headlining, soft close and keyless entry. 
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