Originally Posted By: Audios
Sometimes reservoirs will be more than a gallon, so if you have some of the summer blend or cheaper stuff in there, and add lets say 3/4 of a gallon, you may raise the freezing point by a solid amount.
That's it! I bought the car in Tampa 3 years ago. I very seldom use the windshield washer. I just filled the reservoir up and it only took about a cup and the mix looked bluish orange. Looked awful. I'm gonna drain it all tomorrow and refill. Yechh....