Genuine OEM BMW Oil Separator Crankcase Ventilation, part number 11151705237. This unit is designed to separate oil particles from the crankcase gases before they are recirculated, helping to reduce oil consumption and emissions. It is a key part of the Positive Crankcase Ventilation (PCV) system. The part has dimensions of 0.2374m x 0.1194m x 0.074m. Genuine OEM oil separators are precisely engineered to ensure effective oil separation and proper crankcase pressure regulation, contributing to engine health and environmental compliance.