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Interesting as I have a buddy who swears by some anti-freeze his shop's truck fleet uses can't recall it offhand; it's orange colored and runs some 25 bucks a gallon (not the GM stuff). Someone put me on to reducing the ratio of anti freeze to thwart an over heating problem and this seemed to help though I did several other things as well including adding 'water-wetter' I hadn't heard of. In any case my engine runs cooler now. I have around a 70-30 mix and should be good as I don't drive my ride in winter and sits in a heated garage.
It has to do with the specific heat characteristics of the blended mixture. 50% by volume dilution will supply the best heat transfer provide a good corrosion inhibiter, and freeze ptotection to approx -34° F. Running a higher concentration of antifreeze is usually detrimental for heat transfer. Out of curiosity....find out what your friend uses. If you store your car in a heated garage, why are you running a 70-30% Dexcool water ratio? Or was the ratio 30-70%? You state your engine runs cooler now.....how much cooler....what was it b4 you changed it. A water wetter is an ionic surfactant, which brakes the surface tension of the coolant providing "better" contact with the metallics of the engine and "better" heat transfer......or that's what they want you to believe.
Bob Renton