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Originally Posted by Brad Roberts
Cool. Thanks for the data point!!
People who live up north.. I do NOT recommend the 50/50 mix. Live in the south? Never see temps below 50deg? run 50/50 
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Why? We
only run 50/50 Porsche coolant/distilled water (customer cars and our own), get freeze point test in the -40 to -45 F range; and we see ambient temps well below zero here, and have never had a problem...................