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This vent hose runs from the valve cover on N55 engines. 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 N55 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.
BMW Fitments:
1 Series E82 / E88 (08-13) > 135i N55 (11-13) E82 / E88 (08-13) > 135is N55 (11-13) 3 Series E90 / E91 / E92 / E93 (06-13) > 335i N55 (11-13) E90 / E91 / E92 / E93 (06-13) > 335xi N55 (11-13) 5 Series F10 / F11 (11-16) > 535i F10 / F11 (11-16) > 535i xDrive 6 Series F12 / F13 (12-18) > 640i X1 Series E84 X1 (2013-2015) > X1 35i xDrive X3 Series F25 X3 (2011-2017) > X3 xDrive35i X4 Series F26 X4 (2015-2018) > X4 35i xDrive F26 X4 (2015-2018) > X4 M40i xDrive X5 Series E70 X5 (07-13) > X5 xDrive35i N55 X5 Series F15 X5 (2014-2018) > X5 sDrive35i F15 X5 (2014-2018) > X5 xDrive35i X6 Series E71 X6 (2008-2014) > X6 xDrive35i N55 (10-13) X6 Series F16 X6 (2015-2019) > X6 sDrive35i F16 X6 (2015-2019) > X6 xDrive35i
$39.99
Crankcase Vent Hose, Rein - 135i/335i/435i/535i N55
Vents oil vapor from the valve cover. OEM-type replacement for part #11127584128.
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