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Old 09-21-2001, 10:20 PM
Ken300D Ken300D is offline
Registered Diesel Burner
Join Date: Aug 2001
Location: Northern Virginia
Posts: 2,911
I believe the heat transfer capacity of water is much better than antifreeze. For maximum heat transfer, you'd run 100% water. However, you need some antifreeze to keep the water from freezing (naturally) and also it serves as a water pump lubricant (to some small extent) and it has corrosion inhibitors.

By running 100% antifreeze, you impair the heat transfer capabilities of the coolant - you might have "hot spots" near the cylinder walls that are not reflected in the temperature gauge.

In most cases 50%/50% mix of water/antifreeze works well.

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