Could be a slow leak from the rim. You tire could be perfectly fine. if your rims were slightly bent( you won't be able to tell the difference from just looking at it) you could have a slow leak..quite normal if you lived in the area filled with pothole.. the guys who mount your tires should be able to tell you, cause they will know when they put the tire on.
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2011.5 mineral white e92 zcp 6mt m3
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