What type of coolant does everyone use?

racerhog said

Prestone concentrate "Green" Coolant.... 2 Gal.
Fill the rest with Distilled water....
Run it for 3 years and Dump it, Flush the system, and then start over.
Works like a charm!!!!!!!!!!!

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X2. Not expensive. Near universal availability of (green) Prestone and distilled water make it easy to top off when needed.

Being "Old school" I add a can of water pump lubricant when I change the coolant. Water pump failures = 0.