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mine does the same. It's the valve in the exhaust that changes position at 20 kmh.
It is confirmed by my dealer that it is the valve. They've oiled it a bit and now I can barely notice it anymore, but it's still there. I've complained about it again, but they tell me it's normal and that you always will hear the valve. Doesn't sound normal to me. They will look into it again next time I bring my car in.
Do other M135i owners have this issue?
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