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Message: <blockquote data-quote="Dre L" data-source="post: 630129" data-attributes="member: 57218">From my Chevy, I believe that the dex-cool may have some compat issues with certain metals used in the cooling system / engine.  I think Aluminum was an issue IIRC.I know for sure that if there is a drop of green standard coolant in the system, and you add the dex-cool, it contaminates and negates any benefit of the dex-cool.I also know that if your system did not have dex-cool as the factory fill when new, it made no real difference, since the dex-cool needed to coat the metal components when new to make it effective.I just used it in my Corsica because although it made no difference, orange coolant was cooler looking than green at the time.  It had no negative effect on my system, and was a "recommended upgrade" (more money for GM, total BS).Edit: yes, bring it back for a swap.  Stick to the green, and flush it every 2-3 years or so with a hose / T-Stat change.  That might be a bit too frequent for some, but why take chances.</blockquote>