Crankcase Vent Hose, Bank 1, Rein - F10 550i, F13 650i, F02 750i, X5/X6 50i (N63A)

This vent hose returns oil vapor from the oil separator hose back to the intake manifold on bank 1 (right side) on early N63 engines and includes a check valve to keep oil vapor from returning to the cylinder head. This part fits the 1st generation N63 engine for 2011-2013 550i, 2012 650i, 2009-2012 750i, 2011-2013 X5 50i, and 2008-2013 X6 50i.

The crankcase vent 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 is a N63 crankcase vent hose manufactured by Rein (CRP) Automotive - an original supplier to BMW for many engine components. As an OEM, Rein meets all of BMW's original design, fitment, and performance requirements and is TUV approved. OEM parts are the best alternative to more expensive Original BMW parts because they are virtually identical without the inflated price tag. This part has a two year warranty.