Crankcase Breather Hose Oil Separator Fit For BMW E61 E91 E60 E90 11617531423. Reference OE Number:11157522931,11157527570,11157567801,11617531423 The PCV valve oil separator is made of high quality ABS engineering plastic, which is lightweight, corrosion-resistant, robust and has a longer service life. 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