WW and Water yields the lowest temps as it will have the lowest surface tension. They suggest 15% coolant for street vehicles ( I suggest Prestone Coolant Additive, Water Wetter, and water only) that will not see cold winters. I am stuck in Pennsylvania however and I run 50/50 because if I don't I know it will have a cold snap <-30 and I'll crack the block or sweat the cylinders....CoupedUp wrote:You're running Water Wetter and ONLY distilled water?