Dexcool is supposed to be good for 5 years or 75,000 miles. Been running Dexcool in both of my newer GM vehicles and change it every 75k. No problems noted with either (Cadillac has 208K, Silverado 178K)
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Ed
1968 GTO (Thanks Mom)
2006 Silverado
2007 Cadillac SRX
2015 Chevy Express 
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