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I did my oil cooler while I did the water pump and also billet thermostat housing, I would also change the top radiator hose to the duel alternator one if you haven't yet.
Get the new DieselSite water pump with a built in filter. Bad A$$ IMHO. I'm going to give my dad my coolant filter setup for his truck and get me one of the new ones after the 1st of the year. A very clean setup.
Currently, I just put brand new Preston ELC coolant in it after changing my injector cups. Zero miles on the coolant. I also just add the external filter from Guzzle's write up,new hoses all the way around, new degas bottle and cap.
I was thinking about just going ahead and changing the oil cooler orings while it's all drained even though I'm not showing any signs of leaks at this point.