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If the dealer won't top it off, I'd buy a gallon at the dealer and mix it 50/50 with distilled. Personally I wouldn't cheap out and buy generic stuff. I've heard too many horror stories in regards to BMW cooling systems and coolant. It's smart to have coolant on hand at home anyways. And brake fluid, motor oil, etc....
A cheaper option would be Zerex G-05, but I'd stick with the BMW stuff.
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