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In the early 2000's (Or maybe even before in some cases??) GM switched from using standard Ethelyne Glycol (The Green Stuff) to a new product called Dex-COOL, which is typically orange in color. Dex-COOL is an organic acid and supposed to have a longer service life. However, in some cases, Dex-COOL and related products have caused excessive corrosion in radiators, manifolds and heads. There are a few different trains of thought regarding the use of Dex-COOL. Some people will tell you to flush it out and switch to typical Ethelyne-Glycol and others will tell you two leave in the Dex-COOL. I have had Dex-COOL in my 2002 GMC Truck since I bought it, however, I never let it go the whole 5 years that the service life suggests. I have already flushed the system twice and used the OEM standard Dex-COOL to fill it back up. I have yet to see excess corrosion or any problems in my cooling system. (Knock on wood). Just make sure that what ever you use to mix it 50/50 with water (or stronger if it gets really cold around you).
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∙ 16y ago
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