1、OEM NUMBERS: The referencing part number of the thermostat assembly are 2722000115, 2722000015, 2722000415. Please check the part numbers whether it suits your vehicle before purchasing. 2、VEHICLE FITMENT: This thermostat assembly is a perfect fit replacement for Benz C350 E350 ML350 R350, replacement for Benz C250, replacement for Benz C230 C280, replacement for Benz C300, replacement for Benz CLK350, etc. 3、ENGINE PROTECTION: By controlling the flow and temperature of the coolant, thermostat can stabilize the working temperature of the engine, preventing overheating or overcooling from damaging the engine and protecting the normal operation of the engine. 4、PREMIUM MATERIAL: Made of durable metal for long lasting performance, this thermostat assembly is designed to withstand the demanding conditions of the engine, ensuring reliable and efficient operation. 5、EASY INSTALLATION: Designed as a direct replacement, this thermostat assembly fits seamlessly into your car, making installation quick and hassle free. No modifications required.