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Oil Separation & Breather System

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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Oil Separator Hose - E46, Z4
10X Entries Into Our F80 M3 Sweepstakes
Bavarian Autosport - Corporate Logo
T#:579880
Part#: 55080
In Stock
Sale - Save 20% $ 24.99

This product was last offered at the strikethrough price on
05-03-2026

$ 19.99 USD
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$ 24.99

This product was last offered at the strikethrough price on
05-03-2026

$ 19.99 USD
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Cold climate version for extra insulation! Fits all E46 and Z4 chassis equipped with an M54 engine.
Burgaflex - Corporate Logo
T#:596611
Part#: 11617504536
In Stock
$ 17.99

This product was last offered at the strikethrough price on
09-26-2026

$ 13.99 USD
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$ 13.99 USD
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Keep your vehicle running crisp and leak-free with this premium return pipe manufactured by Burgaflex.
Oil Separator - Crankcase Ventilation System
10X Entries Into Our F80 M3 Sweepstakes
Bremmen Parts - Corporate Logo
T#:8741203
Part#: 11151705237
In Stock
Sale - Save 59% $ 15.99

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05-03-2026

$ 6.50 USD
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$ 6.50 USD
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Critical crankcase ventilation cyclone separator - great replacement or custom install! ​Failure of the oil separator commonly causes problems related to smoking or a check engine light. Featuring an approximately ¾” air inlet/outlet and ½” oil drain outlet, this oil separator/CCV commonly found in custom installations on many vehicles.
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Oil Separator Kit - Level 1
10X Entries Into Our F80 M3 Sweepstakes
Packaged by Turner - Corporate Logo
T#:15710823
Part#: E46M5411_61KT
In Stock
Sale - Save 24% $ 123.99

This product was last offered at the strikethrough price on
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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Crankcase Ventilation Hose
10X Entries Into Our F80 M3 Sweepstakes
Bremmen Parts - Corporate Logo
T#:30629689
Part#: 11157532649
In Stock
Sale - Save 24% $ 15.99

This product was last offered at the strikethrough price on
05-03-2026

$ 12.23 USD
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$ 15.99

This product was last offered at the strikethrough price on
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$ 12.23 USD
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Victor Reinz - Corporate Logo
T#:18889
Part#: 11611729728
In Stock
$ 4.07 USD
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$ 4.07 USD
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PROFILE-GASKET 11611729728 Manufactured by Reinz


Oil Separator - Crankcase Ventilation System
10X Entries Into Our F80 M3 Sweepstakes
Bremmen Parts - Corporate Logo
T#:8741202
Part#: 11151705272B
In Stock
Sale - Save 17% $ 22.99

This product was last offered at the strikethrough price on
05-03-2026

$ 19.07 USD
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BMW has an issue with oil separators freezing in cold weather if the engine is not fully warmed up during driving. Common symptoms are a howling noise followed by oil leaks. Crankcase breather valve used to purge the oil vapor from the engine block into the valve cover. This valve has 4 hoses connected to it, running to dipstick, valve cover, air intake.
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URO Crankcase Vent Valve Repair Kit - B58
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:55713528
Part#: 11121025447
In Stock
New Item
$ 222.99

This product was last offered at the strikethrough price on
07-08-2026

$ 219.99 USD
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$ 219.99 USD
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The URO Parts Crankcase Vent Valve Repair Kit is the smart technician's fix for the notorious BMW crankcase ventilation failures.

Bremmen Crankcase Ventilation Hose - E39 E53 E60 E83 E46
10X Entries Into Our F80 M3 Sweepstakes
Bremmen Parts - Corporate Logo
T#:640147
Part#: 11611432559
In Stock
Sale - Save 22% $ 23.99

This product was last offered at the strikethrough price on
05-03-2026

$ 18.76 USD
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$ 23.99

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Crankcase Vent Hose - From Valve Cover to Oil Separator - Fit BMWs with the M52 or M54 6 cylinder engine

3 Pin Connector
10X Entries Into Our F80 M3 Sweepstakes
ECS - Corporate Logo
T#:33412930
Part#: 12521706096
In Stock
Sale - Save 11% $ 10.99

This product was last offered at the strikethrough price on
06-14-2026

$ 9.78 USD
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Includes connector housing with terminals and seals. Commonly used for the idle air control valve (IACV).

ECS Tuning replacement harness connectors include all necessary pins and wire seals for a complete harness repair. Whether you have a broken harness connector or need a complete wiring repair, we have the components you need.

Each connector includes an additional terminal in case one becomes lost or damaged during installation.

*OEM cross reference PN# 12521706096 - Commonly used for the idle air control valve (IACV).

Please reference the original part number from the existing connector to confirm fitment, before ordering.

Suggested tools:

Suggested crimping pliers: T#387193
Wire De-pin tools:
12pc De-Pin Tool Set - T#386379
23pc De-Pin Tool Set - T#641943

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Victor Reinz - Corporate Logo
T#:592731
Part#: 07119906360
In Stock
$ 3.99

This product was last offered at the strikethrough price on
05-07-2026

$ 2.99 USD
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$ 3.99

This product was last offered at the strikethrough price on
05-07-2026

$ 2.99 USD
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If this gasket fails it can cause oil leaks and other issues. Replace it at any sign of failure!
BMW Crankcase Pressure Regulator Valve
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:46478579
Part#: ABH0263
In Stock
$ 23.99 USD
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$ 23.99 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 Valve
5X Entries Into Our F80 M3 Sweepstakes
5X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
Hengst - Corporate Logo
T#:22064588
Part#: AS819M
In Stock
$ 41.99

This product was last offered at the strikethrough price on
05-03-2026

$ 31.99 USD
Limited Qty Sale
Free Shipping on orders $49 and up
$ 41.99

This product was last offered at the strikethrough price on
05-03-2026

$ 31.99 USD
Limited Qty Sale
Free Shipping on orders $49 and up
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.
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Elring Crank Case Vent Valve Gasket - M60 M62
2X Entries Into Our F80 M3 Sweepstakes
Elring - Corporate Logo
T#:362757
Part#: 11611729728
In Stock
$ 7.13

This product was last offered at the strikethrough price on
06-03-2026

$ 6.11 USD
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$ 6.11 USD
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This gasket seals the PCV valve to the valve cover. If this leaks, you maybe experience poor running conditions or check engine lights. Replace your leaking seal with a new Elring gasket to ensure long lasting reliability. 

Elring is one of the biggest OEM names in the manufacturing of high quality gaskets that are available for very affordable prices. Elring has supplied many automotive names for years with the gaskets that seal your car's components from day 1 so you can rest assured that these components will last for a long time to come!

Fits the following BMW engines:
M60 3.0L 4.0L
M62 4.4L

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Crankcase Ventilation Refresh Kit
10X Entries Into Our F80 M3 Sweepstakes
Packaged by Turner - Corporate Logo
T#:57543744
Part#: 11158647962KT2
In Stock
New Item
$ 265.99

This product was last offered at the strikethrough price on
09-29-2026

$ 264.99 USD
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$ 264.99 USD
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Maintain optimal engine vacuum and prevent oil blow-by failures under hard driving with this complete Crankcase Ventilation Refresh Kit. Aged oil separator valves and heat stressed plastic hoses fail unexpectedly, leading to oil ingestion, loss of power, and damaged rear main or valve cover gaskets from excessive crankcase pressure buildup. Designed as a direct fit refresh, this kit ensures crisp throttle response, proper engine breathing, and total peace of mind on the street or track.
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Engine Vent Hose 11151740393
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:6703
Part#: 11151740393
Back Ordered
$ 5.89 USD
Free Shipping on orders $49 and up
ENGINE VENT HOSE 11151740393

Intake Manifold Rubber Grommet 13411733217
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:7203
Part#: 13411733217
In Stock
$ 12.65

This product was last offered at the strikethrough price on
09-23-2026

$ 11.99 USD
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$ 11.99 USD
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FUEL PREPARATION INTAKE MANIFOLD RUBBER GROMMET 13411733217
Rein PCV Hose - E36, Z3
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:379766
Part#: 11151740393
In Stock
$ 7.19 USD
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Attaches the PCV to the oil dipstick tube

Burgaflex - Corporate Logo
T#:57725182
Part#: 11157646086
In Stock
New Item
$ 76.99 USD
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Keep your performance engine running cleanly and efficiently with the Burgaflex Crankcase Ventilation Connecting Pipe for Cylinders 1-4.
Rein - Corporate Logo
T#:34181269
Part#: 11157831311
In Stock
$ 11.99 USD
Free Shipping on orders $49 and up

Crankcase Vent Hose ABV0329 is an essential component designed for BMW engines, ensuring optimal performance of the crankcase ventilation system. This high-quality vent hose plays a critical role in regulating and redirecting excess gases from the crankcase back into the engine's intake, reducing harmful emissions and preventing pressure buildup. Crankcase Vent Hose ABV0329 helps maintain engine efficiency and protects against potential damage caused by over-pressurization or oil leaks.

Made from durable, heat-resistant materials, this hose is built to withstand the high temperatures and pressures common in BMW engines. It is a direct-fit replacement, making installation simple and efficient for both professionals and DIY mechanics. Available from Turner Motorsport, Crankcase Vent Hose ABV0329 is the perfect solution for restoring and maintaining your BMW’s crankcase ventilation system.

Key Benefits:

  • Ensures proper crankcase ventilation for optimal engine performance
  • Reduces harmful emissions by redirecting excess gases into the intake
  • Prevents pressure buildup and protects against oil leaks
  • Constructed from durable, heat-resistant materials for long-lasting reliability
  • Direct-fit replacement, ensuring easy installation for various BMW models
  • Available from Turner Motorsport, a trusted source for BMW performance parts
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Crankcase Ventilation Hose - E46 M3 Z3M Coupe S54
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:25109076
Part#: 11157831311
Ships on Nov 10, 2026
$ 17.99 USD
Free Shipping on orders $49 and up

This hose runs from the oil separator to the intake manifold and is designed to allow the recirculation of built-up oil vapors.

Due to its proximity to engine heat, this hose tends to get brittle and break as it ages. This can lead to oil leaks, vacuum leaks, misfires, and more.

If your crankcase ventilation hose is brittle or leaking, replace it with this unit from URO Parts.

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Vaico Oil Separator Valve - E38, E39
We Price Match - Give Us A Call or Chat!
Vaico - Corporate Logo
T#:363292
Part#: 11151705272
In Stock
Sale - Save 25% $ 31.99

This product was last offered at the strikethrough price on
05-02-2026

$ 23.87 USD
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Sale - Save 25%
$ 31.99

This product was last offered at the strikethrough price on
05-02-2026

$ 23.87 USD
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Connects to the vent tube which is attached to the PCV valve
Cold Climate Oil Separator Kit - Level 2
10X Entries Into Our F80 M3 Sweepstakes
Packaged by Turner - Corporate Logo
T#:15744065
Part#: 114317400450-KT
In Stock
Sale - Save 41% $ 231.99

This product was last offered at the strikethrough price on
06-15-2026

$ 137.46 USD
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Sale - Save 41%
$ 231.99

This product was last offered at the strikethrough price on
06-15-2026

$ 137.46 USD
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If you are ready to perform a truly complete oil separator system service, our Level 2 kit provides you with all of our Level 1 kit components plus a throttle body gasket, throttle body inlet boot, ICV grommet, and dipstick tube o-ring. Our Level 2 Cold Climate kit includes the following: Oil separator - BMW cold climate recommended Hose from oil separator to dipstick tube - BMW cold climate recommended 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 Throttle body gasket Throttle body inlet boot ICV rubber grommet Oil dipstick tube o-ring seal It is highly recommended to replace the oil dipstick tube with the updated design by BMW as this also a common place for sludge to build up.
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Bremmen Parts O Ring
10X Entries Into Our F80 M3 Sweepstakes
Bremmen Parts - Corporate Logo
T#:558205
Part#: 11617533329
In Stock
Sale - Save 30% $ 6.99

This product was last offered at the strikethrough price on
05-03-2026

$ 4.89 USD
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Sale - Save 30%
$ 6.99

This product was last offered at the strikethrough price on
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$ 4.89 USD
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Seals the PCV angle connector to the intake manifold


URO Crankcase Ventilation Hose - BMW M52TU M54
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:377307
Part#: 11157532649
Ships in 1 Business Day
$ 12.99 USD
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$ 12.99 USD
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From oil separator to dipstick tube
Pressure Regulator Valve Repair Kit
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:600041
Part#: 11127547058
Ships in 1 Business Day
$ 14.99 USD
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Rein Crank Case Ventilation Valve
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:17704764
Part#: 11158647298
In Stock
$ 61.80

This product was last offered at the strikethrough price on
09-29-2026

$ 60.03 USD
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$ 60.03 USD
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Designed to be a direct fit for OEM hoses, Rein has replacements for an affordable cost.

Upper Oil Separator Vent Tube
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:384805
Part#: 11611440317
Ships in 3 Business Days
$ 20.30 USD
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URO - Corporate Logo
T#:2853
Part#: 11611432559
Ships in 1 Business Day
$ 14.99 USD
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$ 14.99 USD
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This Crankcase Vent Hose - From Valve Cover to Oil Separator fits BMWs with the M52 or M54 6 cylinder engine including E46 323i 325i 328i 330i E39 525i 528i 530i E60 525i 530i X3 2.5i 3.0i X5 3.0i Z3 2.5 2.8 3.0i Z4 2.5i 3.0i.

This item fits the following BMWs:
1999-2005 E46 BMW 323i 323ci 328i 328ci 330i 330ci 330xi
1999-2005 E46 BMW 325i 325ci 325xi - only with M54 engine
1999-2003 E39 BMW 528i 528i 530i
2004-2005 E60 BMW 525i 525xi 530i 530xi
2004-2006 E83 BMW X3 2.5i X3 3.0i
2000-2006 E53 BMW X5 3.0i
1999-2002 Z3 BMW Z3 2.3 Z3 2.5i Z3 2.8i Z3 3.0i
2003-2006 E85 BMW Z4 2.5i Z4 3.0i
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Vacuum Pipe
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:17704694
Part#: 11157603816
Ships in 3 Business Days
$ 35.99 USD
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PCV Valve - Left Cylinder Bank
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:45723146
Part#: 11157563505
Ships in 3 Business Days
$ 19.99

This product was last offered at the strikethrough price on
04-28-2026

$ 15.99 USD
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$ 15.99 USD
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The Pressure Control Ventilation (PCV) valve is designed to route high-pressure blow-by gases from the crankcase into the intake manifold, relieving excess pressure while recycling gases back into the combustion process. When the PCV valve fails, it can lead to excessive oil consumption, rough idle, and stored engine fault codes. Replacing a worn or faulty valve restores proper crankcase ventilation, smooths out idle, clears codes, and helps keep your engine performing at its best.
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Rein Return Pipe - E39, E46, E53, E60, E83, Z3, Z4
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:375092
Part#: 11617504536
In Stock
$ 19.99 USD
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$ 19.99 USD
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Runs from the intake manifold back to connecting hose
Crankcase Ventilation Hose
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:378279
Part#: 11617533398
Ships in 1 Business Day
$ 21.99 USD
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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.
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Hose - From Oil Separator to Oil Dipstick Tube - E46 E39
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:2879
Part#: 11157532629
In Stock at Vendor
$ 10.99 USD
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$ 10.99 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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Crankcase Ventilation Dipstick Hose - BMW M52TU M54
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:359570
Part#: 11157532629
Ships in 1 Business Day
$ 12.99 USD
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This tube runs from the oil separator to the lower dipstick tube.

 

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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URO PCV Valve - Left Cylinder Bank - BMW N73 6.0L
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:592794
Part#: 11157563505
Ships in 1 Business Day
$ 30.99 USD
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When the crankcase vent valve fails it can cause excessive oil consumption, engine fault codes and poor idle.
Return Pipe
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:372847
Part#: 11617504536
Ships in 1 Business Day
$ 16.99 USD
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$ 16.99 USD
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Runs from the intake manifold back to connecting hose

Oil Separator Valve
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:594299
Part#: 11617531423
Ships in 3 Business Days
$ 120.81 USD
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$ 120.81 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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Febi - Corporate Logo
T#:6707
Part#: 11157532649
Ships in 1 Business Day
$ 19.12

This product was last offered at the strikethrough price on
05-29-2026

$ 17.68 USD
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$ 17.68 USD
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ENGINE VENT HOSE 11157532649
Rein - Corporate Logo
T#:39059263
Part#: 11151705272
In Stock at Vendor
$ 25.00 USD
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$ 25.00 USD
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BMW Oil Separator Valve | E38 E39 540i 740i 740iL M62 4.4L Engine is an essential component designed to maintain optimal engine performance by purging oil vapors from the engine block into the valve cover. This valve features four hoses connecting it to the dipstick, valve cover, and air intake system, ensuring efficient crankcase ventilation. BMW engines, especially in colder climates, are known to experience issues with oil separators freezing if the engine isn't properly warmed up, leading to symptoms such as howling noises followed by oil leaks.

  • Effectively purges oil vapors from the engine block to maintain clean operation
  • Designed for BMW E38 and E39 models with M62 4.4L engine
  • Helps prevent oil separator freezing in cold weather conditions
  • Features four hoses connected to the dipstick, valve cover, and air intake for optimal ventilation
  • Reduces engine sludge buildup, preventing potential damage and maintaining efficiency
  • Durable construction to withstand high temperatures and the demands of the engine

Replace a worn oil separator valve to maintain the proper ventilation and efficiency of your BMW engine, preventing oil leaks and other performance issues.

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Oil Separator
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:555633
Part#: 11151705237
Ships in 1 Business Day
$ 10.99

This product was last offered at the strikethrough price on
05-05-2026

$ 7.99 USD
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$ 7.99 USD
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Critical crankcase ventilation cyclone separator - great replacement or custom install!
"Cold Climate" Crankcase Pressure Regulator Valve
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:376770
Part#: 11617533400
Ships in 1 Business Day
$ 40.99 USD
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$ 40.99 USD
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Commonly referred to as the "oil separator" or PCV

OEM Rein Oil Separator Vent Hose - E60/1 E90/1 N52
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Rein - Corporate Logo
T#:402020
Part#: 11617522933
Ships in 1 Business Day
$ 19.99 USD
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If your BMW has a damaged vent hose, be sure to replace it to restore functionality of this rather important emissions system.

Victor Reinz - Corporate Logo
T#:19104
Part#: 11151747978
Ships in 1 Business Day
$ 5.69

This product was last offered at the strikethrough price on
06-05-2026

$ 4.88 USD
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$ 4.88 USD
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O-RING 11151747978 Manufactured by Reinz

Rein Crankcase Ventilation Hose - Cylinders 1-4
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Rein - Corporate Logo
T#:17738390
Part#: 11617563476
Ships in 3 Business Days
$ 46.99 USD
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$ 46.99 USD
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Manufactured with high-quality materials to withstand heat, dirt, and debris, matching OE expectations.
Packaged by Turner - Corporate Logo
T#:221962
Part#: TMS221962
Ships in 1 Business Day
$ 458.99 USD
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$ 458.99 USD
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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
  • 11157567801, 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
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    PCV Adapter Fitting N54
    2X Entries Into Our F80 M3 Sweepstakes
    Vargas Turbo Technologies - Corporate Logo
    T#:557961
    Part#: VTT-PCV-ADAPTER
    Ships in 10 Business Days
    $ 145.99 USD
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    $ 145.99 USD
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    Vargas Turbo has you covered when you are installing a custom turbo setup. With all of the adapters you need and all the valves necessary, the only real limiting factor is your imagination!

    This is the adapter fitting that is required to convert your N54 to external PCV if you want to keep your crankcase under vacuum at idle, and anytime you have a vacuum condition in your intake manifold. They are made from 6061-T6 with black anodizing for a long-lasting finish. Includes complete adapter, with all o-rings, and retaining clip.

    This must be used in conjunction with  the Vargas billet check valve, and PCV delete fitting or requires plugging of the intake PCV ports. Installs inline on the throttle body, and adds a -8AN male to adapt to a catch cans, or any custom set up.

    Made from 6061-T6 with black anodizing for a long-lasting finish. Includes complete adapter, with all o-rings, and retaining clip

    This part fits the following BMW engines: 
    2006-2012 N54

     

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    BMW Breather Valve
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    Febi - Corporate Logo
    T#:17339405
    Part#: 11127537733
    Ships in 1 Business Day
    $ 27.99

    This product was last offered at the strikethrough price on
    05-29-2026

    $ 19.99 USD
    Free Shipping on orders $49 and up
    $ 19.99 USD
    Free Shipping on orders $49 and up
    Are you experiencing a slight loss of power? This pressure regulator valve repair kit could easily be the culprit. With a bad gasket or weak spring you could be losing pressure, resulting in less power.
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