The Mishimoto Thermostatic Oil Sandwich Plate is a lightweight, high-flow sandwich plate built from 6061 aluminum. It's used to add an external cooler to your vehicles oil system. 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 DegreeF (85 DegreeC) thermostat can be replaced with a 160 DegreeF (71 DegreeC) or 200 DegreeF (93 DegreeC) unit, adding unparalleled control over your desired engine oil operating temperature. This Oil Sandwich Plate is designed specifically for M22 Stainless Steel Center Bolts and includes a 1/8" NPT plugged port on the side for an optional sensor or gauge as well as our Mishimoto Lifetime Warranty.