This Mishimoto Thermostatic Oil Sandwich Plate 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 warmup at startup and extra oil system protection in cold climates.The included 185 degree Fahrenheit thermostat can be changed with a 160 or 200 degree unit, adding unparalleled control over your desired engine oil operating temperature.