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16 750i whistling noise from engine bay around 1000-1200 RPM
My 16 750i makes some whistling noise(some high pitch sound) around 1000-1200 RPM after I drive around 30 mins. It is not loud but somehow annoying. After some testing, I can make sure it is not AC noise or turbo noise. The technician in the dealership can also hear the noise but didn't know how to fix that. I know some F01/F02 with N63TU have the same issue due to their PCV system. But BMW changes their design for N63TU2 PCV system so I'm not sure if it is a PCV issue. Any ideas?
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