[Big Dave]

I use the Evans stuff. I use it to eliminate a problem unique to my engine. 7.3 liter Powerstrokes (aka International T444E) were designed for savage duty and have extremely high-flow water pumps. So high in fact that they tend (in pickup truck duty) to cavitate the front two cylinder liners. Water-based coolant literally boils in the surface of those liners and will erode through. Ford and International sell an additive that suppresses this but it must be monitored and periodically renewed. With its low vapor pressure, the Evans eliminates this problem. Also waterless Evans pretty much eliminates cooling system corrosion.

The best I could find is a 203 degree stat. We need to find somebody who can design and fabricate a higher temp stat.