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Oil Separation & Breather System for BMW Z Series E85/6 (2003-2008)

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Every car has a crankcase vent system that is supposed to suppress oil from making it into the intake ports and combustion chamber. A good functioning system will separate oil from the atmosphere and return it to the oil pan (or collect it in a catch can) while allowing the leftover vapors to burn in the combustion chamber or recirculate through the system. This has always been known as a PCV system (Positive Crankcase Ventilation) but BMW has several other names for it - oil separator, crankcase vent (CCV), and cyclonic separator. Failures in the system will allow raw oil to enter the intake and eventually into the engine itself which can have disastrous effects on engine performance and longevity. As emissions regulations on oil and gas venting have gotten more stringent the PCV systems have gotten more complex and failure prone. And because the CCV is intertwined with other systems you could experience rough running, loss of power, higher oil consumption, misfiring, stalling, or other annoying issues. There is no replacement interval for these so we recommend inspecting your crankcase vent system as part of your regular maintenance routines. Symptoms of a bad crankcase vent are: whitish or yellowish film on the underside of the oil cap, whistling/squealing noises (not caused by a belt), suction on the oil cap that makes it hard to unscrew, large amounts of white smoke from the exhaust, and excessive oil consumption.

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CCV/PCV Breather Hoses (9)

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Comprehensive Constant Pressure Valve Replacement Kit

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T#:557341

Part#: 11111318185TMSKT

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05-03-2026

$ 84.32 USD

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When your CPV O-ring fails it causes a slow oil leak on the passenger side of the engine, making an oily mess that frequently resembles a rear main seal leak. Replacing the CPV with an upgraded o-ring ensures a long-term solution to this common problem.

The factory o-ring over time fails from heat cycling and oil exposure due to the Buna rubber used in OEM o-rings, while the included Viton Fluoroelastomer is resistant to a much higher temperature to ensure prolonged life without leaking.

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Rein Crankcase Ventilation Return Pipe - E60, E90, Z4

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T#:402081

Part#: 11157567801

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Sale - Save 8% $ 81.38

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08-13-2026

$ 75.04 USD

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Located under intake manifold

Crankcase Ventilation Hose Kit M54 Engine

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T#:379190

Part#: 11617504535K

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08-31-2026

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Turner Motorsport presents the Crankcase Ventilation System Refresh Kit for BMW owners experiencing malfunctioning or aged CCV systems. This comprehensive kit includes all necessary hoses to complete a refresh, ensuring optimal performance and reliability for your BMW's CCV system.

Addresses malfunctioning CCV systems
Ensures proper ventilation of the crankcase
Comprehensive kit includes all necessary hoses
Restores performance and reliability
Compatible with various BMW models

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Rein Crank Case Vent Hose - E60, E82, E83, E88, E90, E91, E92, E93, Z...

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T#:402018

Part#: 11157559528

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08-31-2026

$ 46.54 USD

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Over time this hose can become clogged and blocked up causing running problems. This is a direct factory replacement for the PCV hose.

Rein Crankcase Vent Hose

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T#:17804807

Part#: 11157522931

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08-23-2026

$ 37.04 USD

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Manufactured with high-quality materials to withstand heat, dirt, oil, and other debris.

Upper Oil Separator Vent Tube

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T#:378292

Part#: 11617504535

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08-31-2026

$ 21.84 USD

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Runs from the top of the oil separator up to intake manifold.

Upper Oil Separator Vent Tube

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T#:552486

Part#: 11617533399

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08-31-2026

$ 34.19 USD

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Runs from the top of the oil separator up to rear of the intake manifold.

OEM Rein Oil Separator Vent Hose - E60/61 E90/91 Z4

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T#:13029

Part#: 11617559530

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Sale - Save 38% $ 66.99

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05-07-2026

$ 41.79 USD

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BMW has an ongoing issue with oil separators freezing in cold weather if driving is done before the vehicle is fully warmed up. There is often a howling noise followed by numerous oil leaks. The crankcase breather valve is used to purge the oil vapor from the engine block into the valve cover. However, sometimes condensation can cause it to freeze, causing the entire oil separator system to fail, crack, and disintegrate. Replace this and all the other components of the oil separator system to prevent damage to all the aspects of your engine. As long as you have everything off, you can rest assured that new parts will last and be reliable.

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Oil Separator Kit - Level 1

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T#:15710823

Part#: E46M5411_61KT

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05-03-2026

$ 93.71 USD

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Replace all the components of the oil separator system together to prevent damage to all the aspects of your engine. As long as you have everything off, you can rest assured that new parts will last and be reliable. BMW has an ongoing issue with oil separators freezing in cold weather if driving is done before the vehicle is fully warmed up. There is often a howling noise followed by numerous oil leaks. The crankcase breather valve is used to purge the oil vapor from the engine block into the valve cover. However, sometimes condensation can cause it to freeze, causing the entire oil separator system to fail, crack, and disintegrate. ur Level 1 kit includes the following; Oil separator Hose from oil separator to dipstick tube Hose from oil separator to valve cover Hose from intake manifold back to the connector hose Hose from oil separator up to the intake manifold

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BMW Crankcase Pressure Regulator Valve

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T#:46478579

Part#: ABH0263

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$ 22.35 USD

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BMW has an ongoing issue with oil separators freezing in cold weather if driving is done before the vehicle is fully warmed up. There is often a howling noise followed by numerous oil leaks. The crankcase breather valve is used to purge the oil vapor from the engine block into the valve cover. However, sometimes condensation can cause it to freeze, causing the entire oil separator system to fail, crack, and disintegrate. Replace this and all the other components of the oil separator system to prevent damage to all the aspects of your engine. As long as you have everything off, you can rest assured that new parts will last and be reliable.

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Rein Return Pipe - E39, E46, E53, E60, E83, Z3, Z4

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T#:375092

Part#: 11617504536

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08-31-2026

$ 18.99 USD

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Runs from the intake manifold back to connecting hose

Hose - From Oil Separator to Oil Dipstick Tube - E46 E39

For use in cold climates

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T#:2879

Part#: 11157532629

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Sale - Save 13% $ 11.99

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03-26-2026

$ 10.44 USD

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This is the updated hose that goes from the Crankcase Oil Separator Valve to the oil dipstick tube. This tube tends to get plugged with oil sludge and becomes brittle and cracks. It fits E46 323i 323ci 325i (M54) 325ci (M54) 325xi 328i 328ci 330i 330ci 330xi - E39 525i 530i - E60 525i 530i 2004-2005 - X3 2.5i 3.0i 2004-2006 - Z3 2.5i 3.0i - Z4 2.5i 3.0i 2003-2006.
In german, Rein means Pure. In the automotive industry the Rein name has quickly come to represent quality. With fitments for some of the world’s finest automobiles including BMW and Mini and guaranteed OE quality, Rein is a name you can trust.

This item fits the following BMWs:
2001-2005 E46 BMW 325i 325ci 325xi Only for cars with M54 engine
1999-2005 E46 BMW 323i 323ci 328i 328ci 330i 330ci 330xi
2001-2003 E39 BMW 525i 530i
2004-2005 E60 BMW 525i 525xi 530i 530xi
2004-2006 E83 BMW X3 2.5i X3 3.0i
2001-2002 Z3 BMW Z3 2.5i Z3 3.0i
2003-2005 Z4 BMW Z4 2.5i Z4 3.0i

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Oil Separator Valve

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T#:594299

Part#: 11617531423

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Sale - Save 5% $ 120.81

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08-31-2026

$ 114.77 USD

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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.

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Rein Crankcase Ventilation Hose - E39, E46, E60, E83, Z3, Z4 ...

2X Entries Into Our F80 M3 Sweepstakes

T#:359420

Part#: 11157532649

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Sale - Save 5% $ 11.99

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08-31-2026

$ 11.39 USD

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ENGINE VENT HOSE 11157532649

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Oil Separation & Breather System
- CCV/PCV Breather Hoses (9)

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