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Last fall I checked my cars anti-freeze with a new cheap pocket tester and found my `35 checked around +15 degrees. I had to drain some coolant out to make room for new anti-freeze. I saved a cup of the old anti-freeze and for grins I put it in the freezer compartment of the refrigerator I have in the garage. I didn't check but assumed (yeah I know) the temp is maintained at around zero. The anti-freeze in the cup never did freeze or even turn mushy.