The Mishimoto Chevrolet Duramax high temperature thermostats activate at
a higher temperature than the OEM thermostats, making them the perfect
solution for Duramax owners who live in colder climates, or have trouble
reaching operating temperatures. Activating at a higher temperature
means the thermostats will allow the coolant to stay in the engine
longer delaying the coolant flowing through the radiator, which allows
the engine to warm up sooner.