Ok, smoke test done by Indy came out negative- no vacuum leaks. Further, my diagnosis shows that the car still smokes after unplugging the pcv hoses and sealing intake manifold ports. I idled for around 20 minutes then revved until smoking stopped, idled again and repeated the process multiple times with the same results- heavy blue-white smoke. So this proves that the valve stem seals is the source of the oil and not the CCV system.

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'05 E53 X5 4.4i, '97 E39 528, '07 E92 335i, '16 F86 X6M.