Treat your Durango to a dose of reliability with the Mishimoto 3.7L/4.7L racing thermostat specifically engineered to reduce engine temperatures and improve engine longevity. Mishimoto thermostats are digitally calibrated, feature high-quality wax to ensure precise and consistent opening temperatures, and include a gasket for seamless installation. To provide improved cooling efficiency, the Mishimoto 3.7L/4.7L racing thermostat opens at a lower temperature (180°F) compared to standard thermostats (195°F). This allows coolant to flow through the engine sooner, thus reducing and maintaining cooler engine temperatures. Whether your Durango takes you to work every day or on a ride to the camp site, the Mishimoto racing thermostat will maintain optimal engine temperatures. As with all our products, this thermostat includes the Mishimoto Lifetime Warranty