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This hose connects from the oil separator to the valve/rocker cover. A common problem with modern BMWs is with the oil separator, or CCV system. Over time, the oil vapours the system that is designed to capture and recirculate can cause clogged lines and other blockages, resulting in oil leaks, reduced engine performance, and other issues. Replace yours with this quality part, manufactured by Febi-Bilstein.
We recommend ordering a complete set of hoses when working on the oil separator system. With age, the connectors become brittle or can prove difficult to remove, and the likelihood of them breaking is high.
Please note: Part numbers are provided for reference only. For correct compatibility to your vehicle, please follow our fitment advice