Hmmm... I also have a 2015 X1 35i MSport, but I'm at 59k and change for miles. At this point, the dealership hasn't mentioned doing anything with my serpentine belt. I'd be really interested to hear what people have to say regarding a replacement interval, it would suck for that to go. Did the dealership mention any symptoms that yours may be wearing out early? Any squeeling, or oil dripping onto the belt?
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