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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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