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Windshield Washer Fluid Dilution

Methanol ratio for any freeze point at any volume.

Methanol ratio37%
Methanol0.37 gal (1 L)
Water0.63 gal (2 L)

About this tool

Type the target freeze point (°F or °C) and the bottle volume. Get the methanol ounces (or milliliters) to add plus the water volume. The r/Cartalk and r/Autodetailing 'ratio for -20 °F winter mix' question that resurfaces every October.

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