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I don't know what race cars run on - I'm just an engineer who presented a fact.
A lower viscosity cooling liquid will reduce pressure loss and less pressure loss leads to a higher flow rate = faster exchange of heat. And a lower viscosity cooling liquid has a more turbulent flow profile = faster exchange of heat.
Undoubtedly water is only a superior coolant in its liquid form (not as vapor). At least thanks to the fact that the cooling system is pressurized the boiling temperature is increased.
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