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I used Redline WaterWetter in my C7 and have it in my C8 too (as I have in all my other cars for the past 20+ years). The C8 already cools very well, but it made a noticable difference in the C7.
No difference whatsoever using Water Wetter in my 2023 C8 Z51, although it helped drop a few degrees in dozens of other vehicles from my 68 Camaro up to my 2016 Vettes during the past 30 years.