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From what I have seen, between my own M at 125K miles, and working in the auto parts field, the big issues relate to the cooling system i.e. expansion tanks, water pumps, coolant sensors etc. Also the crankcase vents and related plastic bits under the hood.
Sway bar links and front control arm bushings go bad, brakes are pricey, the auto rear hatch struts are prone to failure, small things in the seats can have issues, i.e. thigh support motor gear, or active module if equipped.
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