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I've had this same issue in my 13 M6 Coupe. The dealership claims there's no issue with alignment and the tires were road force balanced on installation, but I pick up that oscillation above 85+MPH also. It's been suggested that it's a combination of the paving of the road and wheelbase of the car that causes a 'phase' at a certain speed, because it does diminish on other roads or disappear at higher speeds.
I'm still trying to figure it out, and hope to test when a few friends bring their M6's up for a fall drive, where I can swap cars and see if it happens to all of us (suggesting road conditions) or if it's my car only.
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