Couple of guys have made one special, AFIK no store bought one for the 6.5, consider bypass filtration adds 1-2 extra Qt to system and you get come minor cooling of oil as air passes over the oil filter, also consider adding a Deraile or other trans cooler with electric thermostatic controlled fan, as it will pull trans heat, which adds to heat load radiator has to deal with adding higher coolant temp which in turn makes for higher block & ergo oil temps. Yes GM provided in towing package the tranny & extra oil coole, but works only with air flow acros it, not real handy in stop/go traffic, nor off road crawling, my under bed trans cooler with fan that kicks in with 180F return trans temp keeps in trans pan temp to <200F even when I pull 18K loaded g/n trailer on +100F days. Engine coolant never exceeds 198F
