Reviving this old thread, but has there been any solution to this? My 13 135is does this too, only while stopped though, never while moving. Stock 18" wheels and tire size.
My 07 335i did the same thing!
It seems like it happens when the engine bogs down and the idle drops slightly because of the additional load on the power steering.
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2013 135is DCT Carbon Black Metallic
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