I replaced the seals that are on the valve covers (cps etc) but smoking persists on very extended idle- idled for 20 minutes and there was a huge plume of smoke when I hit the accelerator. There was some improvement in performance so I must have had some vacuum leaks - some sensors had signs of oil leak.

I'm taking her in for a thorough smoke test to rule out any vacuum leaks. If no vacuum leaks are found then I will know I'm dealing with valve stem seals leak, right?

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