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Evans expands as much or more, so an expansion tank is still useful (required if you do a recovery-type system)
Evans Powersports Waterless Coolant is not applicable for a car/truck...the High Performance variant is appropriate. Quoting the Evans recommendation for the powersports variant is not relevant to this discussion.
Since there is no water in the Evans product there is no conversion to vapor at 212 degrees F...in fact, Evans does not vaporize until it reaches 375 degrees F. In a water-based system, an overflow tank is needed to compensate for all the heat that the coolant absorbs after the engine is shut off which raises the temp above boiling...this does not occur with a waterless coolant.
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