As I've said elsewhere, all my cars seem to need a little coolant refill perhaps once every 1-2 years. It seems to be from the fact that coolant when hot, and it gets hot allegedly for emissions systems to operate, that goes into the overflow tank and lets off pressure/steam to a small extent.
The local BMW dealer keeps a jug of coolant as well as windshield washer fluid handy to top-up customer cars that casually drive in.
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