I bought 5 gallons about 20 years ago, when I had more money than time (to consider the implications). The containers are unopened in my garage. I’ll give them away, if you pick them up at my house/garage in NC.

https://greengarageblog.org/17-waterless-coolant-pros-and-cons
https://www.evanscoolant.com/how-it-works/about-waterless-coolant/