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Ideally you should be changing your coolant every 1-2 years according to most sources. Personally i haven't changed my coolant in the 4 years I've owned my car (45K miles) but I plan to do so this fall once temperatures are more bearable for working on the car. I'll probably start changing it every 1-2 years thereafter.
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1997 M3 Coupe - BMWCCA I-Prepared #22
2006 M Roadster - 23,000 miles and slowly counting |