A defective thermostat can result in engine overheating and potential internal damage. Improve the reliability of your 6. 0L cooling system with a Nishimoto Ford 6. 0L Power stroke High-Temperature Thermostat and cast aluminum housing! This thermostat is designed as a direct-fit replacement for your aged factory unit. The Nishimoto thermostat has a higher activation temperature (200°F) compared to the factory thermostat (192°F). The higher activation temperature restricts coolant flow longer to allow a quicker engine warm-up, making this thermostat ideal for use in cold climates. The cast aluminum housing will provide a proper seal and will not rust over time. Like all our Power stroke Performance parts, this thermostat and housing includes the Nishimoto Lifetime .