FD3S Cooling Thread

[0110-M-P]

Originally Posted by albertomg

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.

I just looked this up on Prestone's website. They only had values for 50/50 and 70/30, but they were both the same as what you found. So I would say that your numbers are correct.