I have a 2013. Around 85 to 90 the shimmy is there. Over 105 it goes away. It is a balance/harmonics thing. If you PROPERLY Road Force Balance (with a properly calibrated machine) the tires and keep the pressure at 38-39 psi cold, the shimmy pretty much goes away. These cars All F10 M5's are sensitive to any slight imbalance in the wheels.
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