Well I'm running 3 oil cooled turbos so a whole different deal, but I could heat my oil up to 230 empty just playing with it. Now on the way up here at 60* outside (so not hot) and 26,700 CGVW and 63 mph (car hauler), it would just open the Tstat up at 190. On hot days I can get it up some but it really is night and day difference