First off, almost all antifreeze is ethylene glycol, although there is at least one non-toxic propylene glycol antifreeze available, Sierra. Although Sierra has been on the market for decades, it has never really taken off.
The difference between antifreeze types is the additive mix. Traditional (typically green) antifreeze is now called "non-organic additive technology" (NOAT) and the newer stuff is called "organic additive technology" (OAT). There are also variations that mix non-organic and organic additives.
In general, it's best not to mix additive types, but it's not the end of the world if you do. The main problem with adding old school antifreeze to newer stuff (such as Dex-Cool) is that it tends to reduce the long life of the OAT antifreeze to that of NOAT. I keep both NOAT Prestone and OAT Dex-Cool on hand; the Prestone goes into my tractor and the Dex-Cool goes into my various GM vehicles. There is really no concrete evidence that mixing antifreeze types causes problems (such as sludge), but it's not that big of a deal to keep both types on hand.
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Today's Featured Article - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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