Compatibility: Engine coolant thermostat and housing replacement for E46 E39 X5 X3 Z3 Z4 330i 525i 530i 325i, perfectly matched to the original car, perfect fit and performance, to better meet the needs of different applications. OE Number Reference: Thermostat replacement manufacturer part number 11531437040, same form, fit and function as the original OEM, please make sure the OE number matches the part you are replacing. Effective Temperature Control: Thermostat Housing Thermostat water housing helps stabilize engine temperature, ensuring optimal performance and fuel efficiency, helping the engine run more efficiently and improving temperature regulation and control. Easy to Install: The thermostat housing is designed and manufactured according to the original standards, easy to install and use, the stability and reliability of the car cooling system. No other complicated operations are required, saving time and effort! Construction: The Water Thermostat is made of high-strength