Replaced the 203F thermostat on a 2012 Ram 5.7L with this 180F. Also did a fan removal. The engine runs at about 184°F under normal load and idling in a 100+F outside temperature in Texas. Under full load the engine reaches 198-200F. Gasoline consumption has gone down. I'll update this review once I change the thermostat to 190F out of curiosity.
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