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Recommended method to freeze protect
Super K Windshield Washer Fluid

Add 38oz of methanol to 1 gallon of pre-mixed Super K Windshield Washer Fluid.
This will give you -18° protection.

For larger volume, do the half method

Combine half of a 55 gallon drum of methanol, 1/2 bottle of Super K (kin16), and fill with water. This will give you more than -20° protection, and still be very cost effective.