I did a little experiment. (Don't tell my wife, but the kitchen was my lab). I use Prestone 5/150 in my bus, and Zerex 5/100 (not phosphate free) in my Dodge cargo van. I was curious if my tester would be calibrated the same for both brands. Under controlled conditions, I mixed up a 50% batch (fresh) of each solution, and tested it with a floating dial type tester. To my surprise, the needle read slightly different - not a staggering amount, but consistently different, the orange stuff showing a higher freezing point. Both solutions are ethylene glycol based, so there must be differences in the other additives. I just thought someone else might find this interesting. Regards, Brian Doss '88 Weekender, Queequeg |
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