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I have this supercharger noise on my M240i as well. I have the car for 4 years and I think it has become louder and more frequent. Got me a bit worried. My car has 70.000km.
Before I thought I could only hear it when I drove the car hard and the engine was hot (no track driving though). But now every time I rev it beyond 3500 rpm I can hear it.
Apart from the noise everything is normal. Should I have the car checked anyway or leave it?
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