All of this is great information but has there been any evidence to support that you’ll get longer engine life other than what is speculated here? I once got all wrapped up in monitoring all of my temps and trying to keep things under certain numbers that I read on the internet (ironically the same numbers in this thread were brought up on the diesel threads as well). After years and who knows how much money spent on coolers and fluids etc, I came to realize that it’s all just speculation and theory on paper and that in reality my engine and transmission were going to last well beyond the rest of the truck by just following the owners manual. Since then I’ve taken several vehicles well over a 100k and a couple over 200k miles with no issues. My family that runs a farm and tows heavy often has taken several vehicles well over a 100k and 200k with no break downs. My in laws, friends, etc. All of them run well over a 100k miles and some over 200k with no failures in engines or transmissions. And this is a combination of loaded and unloaded. I worry about the uneducated (not meant to be derogatory) people who come to these forums and read threads like this and without knowing what they are reading, they start throwing money at things that they don’t need to because some really smart people said some really big words. Worrying about trans temps and coolant temps and oil temps is useful for .5% of people who tow regularly and heavy and if you are towing that often and heavy you should probably step up the truck size. The other 99.5% of folks will never have a need to worry about things like this. 2014 z71 LTZ Volant Intake Borla Exhaust Diablo Bilstein 5100 Rough Country Level