I got to spend a decent amount of time with the President of Engine Ice at PRI this past December and he did explain that the -7F point is when it starts to gel. That said, what they advertise for SxS usages, for those that will see cold temps, is rated to -26F. They offered us a sponsorship on our race car that day, so I have a bunch of free Engine Ice coolant in several colors. I am going to try the blue in my turbo S2000 track car and the red in my SxS'.