Mishimoto Sandwich Plate Thermostat is a lightweight, high-flow sandwich plate built from 6061 Aluminum. The built-in thermostat prevents oil flow to the cooler until the engine oil reaches activating temperature, allowing for both a faster warm-up at startup and extra oil system protection in cold climates. Included with 185 degree Fahrenheit thermostat can be changed with a 160 or 200 degree unit, adding unparalleled control over your desired engine oil operating temperature.