Interested in this topic as well. My X1 has about 95k miles and is 7 years old. The belt looks good still but I suspect a refresh is probably in order in the not to distant future.
Has anyone done this job? If so, did you replace the tensioner and other pulleys at the same time?
Since I have turned off the start/stop function there is probably a lot less wear and tear on the belt and related components but I would rather not break down on the highway. interestingly, BMW doesn't mention the belt AT ALL in the maintenance schedule. Not even specifying a visual check!
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