I experienced somthing similar when mine was new...but after several thousand miles it seemed to work its way out. My transmission is great now at 10k miles.

Is your vehicle broken in yet? Are you aware that you have a drive by wire gas pedal? Mine took awhile to get used to, but once I got the hang of it I love it. It tends towant you to be more aggresive on the pedal.

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2013 X5 35i M Sport