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Without hearing your car, I can’t say for sure, especially since I’ve got an M340i. But my car developed a whining/whirring noise that followed the RPMs and it turned out to be the oil pump. After replacement, completely silent. All I hear now is the sweet sound of the exhaust (Active Sound Design turned off).
Are you able to perform an oil level measurement? If not, that could be another sign of a failing oil pump.
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