Same issue with a f30 330 purchased in Argentina ( enginee B48 ). Coolant level below minimum level at both thanks. Dealer answer went from small tank is for the "oil turbo" and second dealer it was for the brakes fluid!!!!!
Third one was more accurate: same liquid as for the big cap but ( coolant ) ......donīt know what for!!!!!
Thanks to this thread I understodd why there are two caps.!!!!!
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