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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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Febi-Bilstein "Cold Climate" CCV Kit - 11617533400S1
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Febi - Corporate Logo
T#:28304463
Part#: 11617533400S1
In Stock at Vendor
$ 238.99

This product was last offered at the strikethrough price on
04-15-2026

$ 225.00 USD
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$ 225.00 USD
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After the introduction of the M52TU/M54 engines, BMW observed an uptick in CCV-related issues, especially in cold regions. Vehicles operating in extremely low temperatures often encountered a blockage in the CCV dipstick hose, leading to elevated crankcase pressure and visible blue smoke from the exhaust. To address this issue, BMW introduced cold climate-specific hoses with foam insulation, preventing condensation and facilitating quicker oil warm-up. This kit incorporates top-notch reproduction cold climate hoses to ensure optimal CCV performance across all weather conditions.

The crankcase ventilation valve, known as the oil separator, PCV, CCV, or crankcase pressure regulator valve, plays a vital role in redirecting oil from your vehicle's intake system back into the engine oil pan. This system comprises numerous plastic and rubber hoses, prone to damage due to prolonged exposure to chemicals and heat.

Designed to tackle or prevent impending CCV system failures, this kit includes four foam-insulated hoses made from durable plastic capable of withstanding heat fluctuations and chemical exposure. Additionally, a new ventilation valve is included for a comprehensive and long-lasting repair solution.

Signs indicating the need for crankcase ventilation system replacement include:

Whistling sounds from the intake manifold, caused by crankcase pressure venting through holes in the CCV hoses. Blue smoke emitting from the tailpipe, indicating oil consumption. Excessive oil usage. Milky or yellowish buildup under the oil cap, suggesting condensation due to ventilation valve malfunction. If you're experiencing misfires, lean fuel codes, decreased fuel efficiency, or noticeable oil consumption, it's advisable to overhaul your crankcase ventilation system. Opt for this reliable system from Febi-Bilstein for a repair that meets factory standards and ensures consistent performance.

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Febi - Corporate Logo
T#:28337855
Part#: 11151703484KIT
In Stock at Vendor
$ 108.14 USD
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Rubber breather pipes in various BMW applications are susceptible to cracking. Over time, engine heat and weather conditions can weaken these hoses, leading to breaks or leaks. This results in significant vacuum leaks that can severely affect engine performance.

Moreover, BMW faces a problem with oil separators freezing in cold weather, particularly if the engine isn't adequately warmed up during driving. Typical signs include a howling noise and subsequent oil leaks.

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Crankcase Vent Return Hose - E46 E39 E60 Z3
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Febi - Corporate Logo
T#:12449
Part#: 11617504536
In Stock at Vendor
$ 31.99

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

$ 26.99 USD
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$ 26.99 USD
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This is the BMW crankcase return line that goes from the intake manifold to the top CCV connecting hose. We also offer a complete CCV repair kit
Since the late 1800’s Febi has been fabricating replacement metal parts. This history is self evident in the quality and vast amount of applications they service. With more than 34,000 repair solutions for cars and commercial vehicles you can be sure Febi has you covered.


This item fits the following BMWs:
1999-2005 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330ci 330xi
1997-2003 E39 BMW 525i 528i 530i
2004-2010 E60 BMW 525i 530i
2004-2005 E83 BMW X3 2.5i X3 3.0i X3 3.0si
2000-2006 E53 BMW X5 3.0i
1/2000-2002 Z3 BMW Z3 2.3 Z3 2.5i Z3 2.8 Z3 3.0i
2003-2005 E85 BMW Z4 2.5i Z4 3.0i

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Oil Separator Valve
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Febi - Corporate Logo
T#:597181
Part#: 11151705272
In Stock
$ 48.59

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

$ 43.15 USD
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$ 43.15 USD
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Crankcase Oil Separator Valve - E46 E39 E60 X3 X5 Z3 Z4
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Febi - Corporate Logo
T#:2855
Part#: 11617501566
Ships on Nov 9, 2026
$ 48.99 USD
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$ 48.99 USD
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This Crankcase Oil Separator Valve fits BMWs with the M52tu 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. It is fairly common for this valve to become plugged with sludge which can create rough idle and excessive oil consumption.
Since the late 1800’s Febi has been fabricating replacement metal parts. This history is self evident in the quality and vast amount of applications they service. With more than 34,000 repair solutions for cars and commercial vehicles you can be sure Febi has you covered.

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 525i 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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Elring Crank Case Vent Valve Gasket - M60 M62
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
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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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

$ 17.01 USD
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$ 17.01 USD
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ENGINE VENT HOSE 11157532649

Febi Crankcase Ventilation Hose - E34
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Febi - Corporate Logo
T#:381678
Part#: 11151708801
Ships in 1 Business Day
$ 11.99

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

$ 9.99 USD
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$ 9.99 USD
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Prone to cracking and breaking.

Febi - Corporate Logo
T#:359557
Part#: 11157532629
In Stock at Vendor
$ 23.28 USD
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$ 23.28 USD
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From oil separator to dipstick tube
Febi Oil Separator - E53
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Febi - Corporate Logo
T#:363700
Part#: 11151705237
In Stock at Vendor
$ 21.99

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

$ 20.99 USD
Free Shipping on orders $49 and up
$ 20.99 USD
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Critical crankcase ventilation cyclone separator - great replacement or custom install!


Intake Manifold Cover (PCV)
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Meyle - Corporate Logo
T#:594546
Part#: 11617501562
Special Order: No Guaranteed ETA
$ 55.99 USD
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An integral part of the emissions system, the PVC valve lets the crank case breathe. This allows proper intake and exhaust flow, resulting in proper running and operation. Often split from underhood heat and age, this vents excess oil into the engine compartment. Replace it now.
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"Cold Climate" Crankcase Pressure Regulator Valve
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Meyle - Corporate Logo
T#:35829339
Part#: 11617533400
Special Order: No Guaranteed ETA
$ 69.99 USD
Free Shipping on orders $49 and up
BMW vehicles are prone to oil separators freezing in cold weather if driven before the engine is fully warmed up. This can lead to a howling noise followed by multiple oil leaks. The crankcase breather valve vents oil vapor from the engine block to the valve cover, but condensation can sometimes cause it to freeze, leading to a failure of the entire oil separator system, causing it to crack and break down. To prevent damage to your engine, it’s best to replace all components of the oil separator system at once. Replacing everything ensures reliable performance and durability. Remember to also order a valve cover gasket to make the replacement process easier.
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