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Wingless Wonder
1988 Esprit Turbo
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6,503 Posts
I have observed the difference between old type coolants and OAT/HOAT types with my own eyes. When I had my Esprit's engine out and replaced all the secondary hoses, there was a LOT of crusty buildup, despite having replaced coolant every 2 - 4 years.

If you want to see what others think, look at the Coolant sub-section of BobIsTheOilGuy.com

Cooling System Fluids & Additives | Bob Is The Oil Guy

Or for an overview, peruse the descriptions in this article in Wikipedia.

Antifreeze - Wikipedia, the free encyclopedia

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All I can say is, I'm glad the twice-yearly maintenance of draining a summer coolant in facvor of a winter coolant is well behind us, here in the 21st century!
 
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