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Originally Posted by supersteve
The Orange Dexcool Stuff is the worst thing that can be put into an engine. It is worse than straight tap water.
Over time it begins to gel in the system. It evetually plugs every opening it goes through. Great if you have a leak. Bad if you want to keep you vehcle running. If you do use it you should flush your system every six months. Most Manufacturers are moving away from Dexcool because of it's plroblems.
What "withidle" is talking about is silicates. The only thing old is his information. Most green stuff is now silicate free. It is only the very cheap stuff that still has the silicates in it. It will also say it on the label.
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You simply don't know of what you speak! I've run the orange DEXCOOL in my 2001 4.4i for 86,000 miles and my coolant system is absolutely pristine; no deposites whatsoever.
Additionally, when I worked for Texaco Lubricants Company I officed several doors down from Rich Armstrong, the nuclear chemist greatly responsible for the development of Havoline Extended Life Anti-Freeze/Coolant. GM thought enough of it to put their DEX-COOL trademark on it and use it as OEM fill in ALL of their vehicles.
I'll address your subsequent reply below.