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Message: [QUOTE="old#48, post: 370911, member: 32272"] Ya know, I left everybody hangin' as to where I got those values, so I'm glad you brought this up. For the difference in thermal conductivity percentages - I got the thermal conductivity values for straight water and the 50/50 mixes of eth gly/water and prop gly/water at 180 degF from the Dow Chemical Engineering Guides for ethylene glycol and propylene glycol. I then calculated the percentages. Numbers wise, the thermal conductivity of ethylene glycol 50/50 with water at 180 degF is 0.238 Btu ft / hr sf degF. For propylene glycol 50/50 with water at 180 degF the thermal conductivity is 0.221 Btu ft / hr sf degF or about 7% less. For straight water at 180 degF, the value is 0.388 Btu ft / hr sf degF. I did just pick up a bottle of WaterWetter on Monday, but haven't tried it yet. The only performance-related-percentage they show on the bottle is - "Improves the ability of coolant to wet heat transfer surfaces by 50%". They also show a temperature bar graph improvement chart on the bottle. No, I did not calculate the thermal conductivity improvement percentages I show by using the temperature bar graph improvement chart or any other info they show on the WaterWetter bottle. I also did not get it from info on the Redline or Maxima or any other website, but thanks for asking - we all gotta look out for each other. [/QUOTE]