Can Zero-Degree Windshield Washer Fluid and Minus Twenty-Degree Fluid Be Mixed?

[CamilleAnn]

They can be mixed, but it will reduce the freeze resistance of the minus twenty-degree windshield washer fluid. Automotive windshield washer fluids are generally categorized into: Summer-use 0-degree fluid and winter-use minus 2-degree or minus 35-degree fluid. The minus 4-degree fluid, which remains unfrozen even at minus 4 degrees, is a special anti-freeze type suitable for extremely cold northern regions. Both 0-degree and minus 20-degree windshield washer fluids have freeze-resistant properties. Apart from their different freeze-resistant temperatures, their other functions are identical, so they can be mixed. Points to note: In autumn and winter, windshield washer fluid should have excellent cleaning and freeze-resistant performance. For winter use, the freeze resistance should be the primary selection criterion, and you should choose a fluid with a freezing point at least 10 degrees Celsius below the local minimum temperature.