It's just not the DexCool rotting the gasket, if the stuff contacts air then it turns to jelly. My cousin had a radiation repair shop and a used Chevy truck and the first thing he did was switch to Presetone because he said he had seen to many cases where the DexCool jellified and caused one hell'ava lot of problems. Don't believe me? This article is from consumeraffairs.com so please do yourself a favor and read it because if you do I bet you will flush that crap out and put in some good Prestone.
http://www.consumeraffairs.com/autom...m_dexcool.html
http://www.consumeraffairs.com/news0...m_dexcool.html
And what *really* gets me; GM is still using that crud! I mean, like, is that the biggest DUH you ever saw in your life, or what? OH! But we have fixed the problem now. Yeah, right. Wait five years down the road then see what happens. It's your 'thang so do what you want to do, and if you don't watch out, GM will stick it to you too. UUHH Baby! Gim'me another shot of that DexCool and lets get smashed. Look, your car is the second biggest inverstment you will ever make, (your house is first). so why would you gamble on your cars engine and use DexCool? Why not do the sensible thing and use tried-and-true Prestone or some other green stuff.
No Sir, I flush and change Prestone anti-freeze in our Taurus and Marquis every three years at Christmas time along with an ATF fluid change and we keep rockin' on down the road. Punkin' Head is coming on so have to run. BOO!