Crankcase Vent/Return Pipe, BMW - E39 540i, E38 740i (M62TU)

Return vent pipe from the oil separator to the intake manifold on M62TU engines used in 1999-2003 E39 540i and 1999-2001 E38 740i/iL.

The system is responsible for separating oil from the air inside the engine and air intake. Liquid oil is returned to the oil pan while oil vapors are sent to the intake manifold to be burned up during the combustion cycle. It's also known as a a PCV, CCV, oil separator, and a cyclonic separator system. Too much oil in the intake air lowers the effective fuel octane, leads to drivability issues, and causes increased emissions. A completely blocked CCV has the potential for very serious engine failure (hydrolock) if liquid oil ends up in the intake. Signs of a failing CCV include: whistling noises in the intake, blueish smoke in the exhaust, high oil consumption, and thick white or yellow gunk under the oil cap.

This part is listed by BMW as BMW part number 11151705301 (11-15-1-705-301) and is described as Genuine BMW Crankcase Vent/Return Pipe for M62tu engine on E39 540i (1999-2003) and E38 740i/740iL (1999-2001).

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