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Correct engine temp certainly revolves around emissions but it's just as important to engine health and longevity. Allow it to run too cool, build up of carbon in the cylinders and crud in the oil will ruin an otherwise healthy engine in relatively short order. The old skool hot rod thinking that anything over 180deg is bad for an engine could not be further from the truth. On the flip side, due to huge improvements in engine management, some later models vehicles run cooler vs one of say 10 or so years ago.