Definitely some cold numbers the past couple days.
One thing to keep in mind, just like when temps approach freezing and people start to freak out about block freezing - it takes time for the entire block to reach those temps.
Remember general rule is 24 degrees for 24 hours to freeze a block with water.
That being said, I do predict frozen block stories will be high next spring.
Half a$$ winterizations where they didn't drain the block before adding anti-freeze or didn't run enough AF though to get a high concentration will freeze at a much higher temp than printed on the bottle. They slipped by in warm to average years but..........
All the more reason I preach: Drain, fill, drain.
Whatever mixture is left will have close to the same corrosion protection properties in the space as if it was filled with AF.
1991 MariStar 240sc, 454, tower, WetSounds, Krypt and Rockford Fosgate