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Whays the - degrees stop point on antifreeze ?


Hybrid_From_Hell
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I think it's something aroubd 65-70% Glycol, as other posters have said.

Increasing the Glycol concentration also increases the boiling-point of the mix - up to around 75% Glycol. Back in my old days of rallying Ford Escorts a 75% glycol mix and a 16PSI radiator-cap would let your bulk-coolant-temperature go up to around 120 Centigrade without problems.

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How i have always understood it;

water has a better thermal transfer of heat than glycol, so in theory should be better than that with glycol added - glycol will raise the boiling temperature but shouldn't be an issue in a car with a pressurised coolant system anyway - glycol obviously has other benefits hence we use it.

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