Genuine OEM Audi Engine Thermostat, part number 059115201H. This essential component regulates the engine coolant temperature, ensuring the engine operates within its optimal thermal range for efficiency and longevity. It is typically located within the oil filter/cooler assembly. This cylindrical thermostat weighs 0.063 kg. Opting for a genuine OEM thermostat guarantees accurate temperature calibration and reliable operation, which is crucial for preventing engine overheating or undercooling, both of which can lead to reduced performance and increased wear.