No this truck is all stock and I only use to pull trailer and it always does this when its hot, I am going to say 90 F or higher while pulling trailer up steep grade . I do here the fan speed increase when the temp starts going up. The state I live in does not have any emission inspection or any other type of inspection I would say I am about the only dodge out here that is not deleted. and yes it has fresh mopar fluid the water pump went out last summer so new pump and fluid I think they put new thermostat I will check. Anyway if the older Cummings did not have EGR why would the 6.7 need them. as far as deleting DEF I think it is for just putting larger pipe to get cooler EGT's , I am not looking to hot rod this truck just cool it down and get a little more power. I understand about legal part and also the engine code I think the tuner takes care of that . So from a mechanical stand point for longevity would the engine run cooler and with more power deleting these items. 60k on the miles