Aisin OE matched engine coolant thermostats are designed for efficient, consistent performance and manufactured using only the highest quality materials. With superior OE technology and know-how, Aisin ensures that every thermostat provides perfect OE form, fit, and function and features the correct OE specified operating temperature. Gasket sold separately. Founded in 1965 to produce original equipment automotive parts, Aisin has grown into a 25+ billion global enterprise with approximately 70,000 employees worldwide. Superior products through engineering excellence, progressive technological development, and dedication to service are some factors which have contributed to bringing Aisin to its position as a multiple-award-winning global leader in automotive parts.