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My 2017 M240i makes the same whine the OP mentions when stationary and out of gear. I put it down to the engine just doing its thing, it is in the bay backwards so all the chains etc are at the bulkhead so I imagine they'll just be naturally louder. It does also have the whiney gearbox I.e it makes the noise in reverse and I think it does it in the lower gears, but you could spend literally days online finding people saying theirs does it too and those cars still going strong so I've just learnt to live with it.
I'm just of the mindset now that the car is smart enough to tell me if something is going wrong with it so no point trying to convince yourself that you think there is something wrong. Unless you have the knocking steering rack, in which case the car won't tell you jack all but it is cheap to fix at least.
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