Genuine OEM Audi Engine Thermostat, part number 059115201B. This essential component is responsible for regulating the engine's operating temperature by controlling coolant flow. It ensures the engine reaches and maintains its optimal thermal range for efficient combustion and reduced emissions. Weighing approximately 0.057 kg, this thermostat is engineered for precise temperature activation and durability. Using a genuine OEM thermostat guarantees accurate temperature regulation, preventing engine overheating or undercooling, which can lead to premature wear and reduced fuel economy.