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      11-30-2012, 08:41 AM   #2
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if you are using an old ball tester it is calibrated only for ethylene glycol type coolants. I don't know what the BMW coolant is but it may be propylene glycol, OAT, etc.

The tester works by reading the specific gravity (density) of the coolant/water mixture and it is ASSuming that you are using a mixture of EG and clean water - but the SG vs. freezing point graph will look different for different types of coolants.