After my minor fiasco with the car having fluid only good to +32 F (California car where anything else is illegal), I hastily went to AutoZone and bought a gallon of the pre-mixed store-brand washer fluid. It claimed to be good to -20 F.

I have to call [censored] on it, truthfully. It was about +20 F last night and every time I sprayed it on the window, it would crystallize and ice up with 2 or 3 seconds, making it totally worthless. Mind you this is with heated washer nozzles.

Promptly went out and bought two jugs of purple Splash!-brand -35 F stuff and put it in. Low-and-behold, it did not crystallize or freeze up at all. I'm really questioning if those cheap fluids meet the advertised specs.

Anyone else have similar experiences with cheap fluids?
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2011.5 BMW M3 saloon ZCP
der stärkste buchstabe der welt
Castrol Edge Professional TWS 10w60 + Mahle OX 254D3