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Dex-cool uses 2-EHA which among other things is a plasticizer which has the effect of softening plastic. GM intake manifolds are made of plastic. If it is found that Dex-cool is dissolving the gasket material, it will validate what some folks have been saying for a long time: Dex-cool eats gaskets. We'll see. Prestone doesn't use 2-EHA in it's long life coolant, instead uses carboxylate.
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pretty sure gm has a tsb floating around where they switched the gasket material used in a lot of 96+ vehicles because the material was being compensated by dex-cool. i don't know much about it but i guess i would switch to a different aftermarket extended-life coolant. they have hybrid coolants that are a mix of dex-cool and mean green using different chemical compositions to achieve the same goal of protecting metals and gaskets and removing heat. they don't contain the "gasket eating" chemicals so it should help that situation. change your coolant every 2 years and you should be good.