Mishimoto Low Temperature Thermostat Kit for 1984-1995 Toyota 4Runner 1981-1985 Celica Racing Aluminum Low-Temperature Thermostat (MMTS-SUP-86L) by Mishimoto®. Temperature: 154.4F. Mishimoto racing thermostats promote greater cooling efficiency by significantly decreasing high engine temperatures resulting from modified and upgraded turbo applications. Once the engine is fully warmed up, the Mishimoto low-temperature racing thermostat will open at a lower temperature than standard thermostats. This allows the coolant to flow through the engine sooner, thus reducing and maintaining cooler engine temperatures.