RPM surge at idle + smoke

[titanle]

I'm wondering if this is related to valve steam seals?

Usually once the hybrid battery is depleted on my E72, the engine kicks in and the RPM surges to about 800-900 and i'll get a nice cloud of smoke. This lasts for a minute or two before the idle backs down and the smoke is gone. Does this sound like valve stem seals? I guess its possible the RPM surges to charge up the hybrid battery but thats just my guess, I dont know.

I dont have excessive oil consumption, my last oil service was 6 months ago and I've driven about 3500 kilometers since. The oil reading is still 100% full.

I dont think i qualify for the SIB regarding the excess smoke/excess oil consumption since I have a 2010 with a build date of late 2009.

Thoughts?