Sunder how many times do I have to answer? Yep we know it's cooling properties are slightly lower. BUT the difference in a radiator is not noticeable! I'd betcha the difference in the coolant exiting the radiator with a 50% mix and without ANY water could not be measured without a labratory! On paper is one thing but in actual use 100% ethylene glycol is the cats meeoooow. No interior rust...ever. Coolant pumps seem to last and last. Lots of good stuff happens.
I'd betcha the rumor of needing water mixed with it to help it cool got started by guys reading the label! In their ignorance of the product they just naturally thought the 50% water was to help it cool. It does not help! Any theory to the contrary is just that...theory!
Big Jim <img src="/forums/images/graemlins/pfft.gif" alt="" />