I believe that BMW had the idea of check and replace if needed at these intervals.
I don't think they'll replace unless the "check" warrants it.
I was at the dealer last November doing the 24 month check. The mileage was 17,000 km on the ODO the service center says bring it in at 20000km for a belt change. The warranty is over after 2 years, I will try to do it my self when the time comes.
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