Fits but does not work. The 2009 750i has a pressurized expansion tank. The coolant flows out of this cap under negative pressure, ie the coolant leaves the tank through this cap even if there is no overpressure in the system. Disappointing but not worth the effort to return. I bought a cap from BMW for $60 it's crazy but it does the job perfectly. 2009 750i with 96,000 miles.
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