That said, I find even the -45 degree stuff I use will frost over at temps below about -30. Not sure if it is vehicle speed dependent. Seems to happen at low speeds also. I think it has more to do with the temperature rating being more of an advertising claim and I suppose maybe the washer fluid tank won't freeze solid at the rated temperature, but the windshield could still frost over... eg if the antifreeze component is more volatile than the water and evaporates quicker than the water on the windshield leaving some water behind as frost... that could be vehicle speed related also I suppose... basically, the conditions for evaporation of a thin film on a windshield are different than for a relatively air tight tank.
I don't ever use the "bug formula" summer fluid, as it would freeze solid, and I don't use wiper fluid as much in summer, so especially for the low miles summer only car - would not want that to freeze while in storage!
reminds me I need to swap my wiper blades as they are starting to streak...
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