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Apart from chemistry of coolant, what concerns me more is the coolant flush intervals. According to BMW requirements I think they don't advise to flush the coolant at any fixed interval. My preferred independant mechanic says he does some chemistry test to decide when to flush the coolant. He mentioned that in a lot of cases BMW water pumps or radiator will fail before the coolant is changed. I request for the coolant to be flushed/changed every 3 years no matter what.
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