DexCool is crap. That is why there are several class action lawsuits against it. Google "dexcool lawsuits". Once contaminated, it will start turning into a brown gel. The first signs will be at your radiator cap and overflow tank. Left unattended it can clog your water passages, cause your engine to overheat and fail. Lots of people in the suits had plastic intake manifolds crack when overheating and are part of the lawsuits.
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