You seem to think Dex-Cool is something other than ethylene glycol. Although there are propylene glycol antifreezes (e.g. Sierra), Dex-Cool is still based on ethylene glycol.
By "green stuff" I assume you mean an antifreeze that uses inorganic (silicate) corrosion inhibitors, such as old-style Prestone. The newer antifreezes such as Dex-Cool use organic corrosion inhibitors, although there are several different chemistries in use. The main reason manufacturers have switched from inorganic to organic antifreeze is the longer life of the latter. You have it backwards: silicate antifreeze has a shorter life than organic. Coolant life wasn't that important back in the days when cast iron ruled, but cars made in the past thirty years use a lot of aluminum, and people weren't changing antifreeze as often as they should, so the OEMs switched to longer-life organic antifreezes. If you want to use silicate antifreeze, better change it often.
The term "permanent" used in the past to describe antifreeze doesn't mean it does not need to be changed. It came about when ethylene glycol antifreeze was introduced. Prior to that, alcohol was used as an antifreeze. Since alcohol as a lower boiling point than water, it would boil off and had to be replaced every fall. When permanent (ethylene glycol) antifreeze was introduced, nobody had even conceived the need for corrosion inhibitors or 100,000 mile antifreeze change intervals.
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Today's Featured Article - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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