6420102091 6420100191 6420100391 6420100591 6420101891 Oil Separator Crankcase Vent Valve Fit For Benz C219 W211 S211 W164 W251 W221. OEM: 6420102091 642 010 20 91 Every detail of the crankcase oil breather valve fits the original vehicle, so there are no complicated steps to install. Made of robust high-strength plastic, the Oil Separator Segregator features anti-corrosion, anti-wear, high-temperature tolerance, and rust-proof properties, ensuring reliable quality and superior functionality. Designed for fuel pre-treatment, the cylinder oil separator breather valve effectively gets rid of water and impurities in fuel, preventing corrosion and wear to the fuel system and engine components caused by these elements., Manufacturer: HAYSXVR