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Guys, 2000km and the humming noise is still happening. Took it in for service, they say that they've cleaned the back rotors, no difference. Still getting the sound, opinions at dealership service department is:
1- its normal, this is the sound of the differential.
2- we need to check other m3's
3- this is normal
I find it weird to tell you the truth. Others riding in my car have noticed as well.
Any ideas?
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