Quote:
Originally Posted by reto
N52 over time, the membrane crankcase ventilation valve mounted inside the valve cover dries and breaks.
Through the torn membrane into the engine gets unaccounted mass air flow sensor.
As a result, the engine can be difficult to start, unstable work (especially at idle), smoke may be misfiring, as the engine can get the dust, which enhances the wear of parts and mechanisms.
If the whistle is heard in the area of finding oil separator, then the membrane is torn.
I found this membrane separately here vanos-bmw.com/membrane-for-cover-n51-n52-n52n-bmw-11127552281
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OP's engine was runing rich which wouldn't be the case if air was leaking in at the membrane, it would run lean.