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Crankcase Oil Separator and Vent Hose Kit - E90 325xi/330xi, E60 525xi/530xi

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Product Details

The BMW N52 engine was deisgned with a crankcase vent system that relies on a heated oil separator valve to separate vapor from the liquid oil. Under ideal circumstances, the oil vapor would pass back into the intake and get burned up during normal combustion. The liquid oil would follow a path back down into the oil pan and be reused. This system is environmentally friendly but plagued with problems. The heating elements can fail or oil and carbon particles can block the oil separator valve. With no escape, the oil will continue to pool and collect in the valve cover or make its way into the combustion chamber leading to excessive oil consumption, blue smoke from the exhaust, idle and running issues. These issues are worse in colder climates where the freezing temperatures create an oil sludge condition that is impossible to clear. The plastic hoses can become brittle and crack which leads to vacuum leaks and oil leaks. Thankfully, the CCV is replaceable on the early N52 engines (2006 and some 2007 models) and should be inspected during a major service and any time the valve cover is off. Oil can also back up into the throttle body, which is easier to check than the oil separator itself. Later N52 engines do not have a serviceable oil vent as it is integrated into the valve cover and not a separate part.

This is a kit containing the oil separator, the vent hoses, and the intake manifold gaskets that are done during a typical oil separator replacement. Complete kit includes:
  • 11617531423, Genuine BMW oil separator
  • 11617559530, vent hose
  • 11157522931, oil separator hose
  • 11157567802, return hose
  • 11157537701, extraction hose
  • 11617547242, intake manifold gaskets (set of 6)
    The intake manifold must be removed to access the oil separator so new profile gaskets are included. We also recommend (but not required) a new oil separator fitting on the intake manifold because it's one of the heated elements that vaporizes the oil as it enters the intake.

    The oil separator can be replaced on its own but for a complete service we also recommend replacing the oil separator hoses and cleaning the valve cover. Any valve cover or intake manifold work should include a new oil separator valve.

    This kit fits the following BMWs:
    10/2005+ E90 BMW 325xi 330xi - Sedan
    10/2005+ E91 BMW 325xi - Wagon
    10/2005+ E60 BMW 525xi 530xi
  • Kit Contents

    Description Qty
    Genuine BMW Extraction Line - 11157537701 - E85,E90 1
    Genuine BMW Return Pipe - 11157567802 - E90 1
    Crankcase Oil Separator - E90 325i/330i, E60 525i/530i, E85 Z4 3.0i/3.0si 1
    Genuine BMW Intake Manifold Profile Gasket Set (Set of 6) - E90 E92 E82 E60 F30 F32 - N52 N54 N55 S55 1
    BMW Engine Vent Hose 11617559530 1
    Crankcase Vent Hose 1

    This Part Fits the Following BMWs

    Make Model Submodel Engine
    BMW E60 525xi N52 3.0L
    BMW E60 530xi N52 3.0L
    BMW E90 325xi N52 3.0L
    BMW E90 330xi N52 3.0L
    BMW E91 325xi N52 3.0L
    *The above product applications have been written by Turner Motorsport. All warranties, product application, fitment, and performance are the responsibility of Turner Motorsport. For additional information see the terms of use.
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