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I found these values after Googling for a bit when I was changing my anti freeze a few weeks ago. Most antifreeze testers won't tell you the percentages. They tell you the unpressurized boil and freeze points which had me scratching my head a bit until I found the values.
Coolant/Water Boil point Freeze point
Ratio
40/60 126°C -23°C
50/50 129°C -37°C
60/40 132°C -52°C
70/30 136°C -64°C
Someone please correct if these values are not valid.
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