Re: Rusty Coolant
Plain demineralized water will absorb heat more but that leads to the lower boiling point as well. Ethylene glycol mix will boil at a higher temperature than water. This makes the cooling capability moot on an engine that runs on the verge of overtemp due to air leaks, thin cylinder walls, and the possibility of a fair amount of crud build up in the tubes of the radiator.
Run water if you want but there is no advantage to it and you have to drain it anytime it freezes.
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