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Oil Separation & Breather System

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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CCV/PCV Breather Hoses (7)

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Engine Crankcase Breather Element

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T#:35795496

Part#: 11617533400

In Stock

$ 41.99 USD

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$ 41.99 USD

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Commonly referred to as the "oil separator" or PCV URO Parts is one of the leading manufacturers of high quality direct replacement aftermarket components, covering a wide range of makes and models. All of their replacement parts are manufactured to ISO 9000 certification standards, so you can expect long lasting performance from URO Parts.

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Burgaflex N52 Engine Breather Hose - 11157522931 - E9x, E60, E61 ...

Earn 5% back in Turner Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

T#:57725177

Part#: 11157522931

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$ 52.99 USD

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$ 52.99 USD

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Maintain peak engine health and keep your crankcase ventilation system operating seamlessly with this high-grade engine breather hose from Burgaflex.

Burgaflex N63 Crankcase Ventilation Connecting Pipe (CCV) - Cylinders...

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T#:57725182

Part#: 11157646086

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$ 76.99 USD

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$ 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.

Burgaflex M52 S52 Vent Hose - Crankcase-Ventilation / Oil Separator -...

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T#:57725180

Part#: 11151740393

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$ 5.99 USD

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$ 5.99 USD

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Maintain your engine's operational integrity and keep vacuum leaks at bay with this essential replacement vent hose from Burgaflex.

Burgaflex M52 M54 Crankcase Ventilation Hose (CCV) - 11157532649 - E4...

Earn 5% back in Turner Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

T#:596606

Part#: 11157532649

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$ 12.99 USD

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$ 12.99 USD

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Maintain peak engine health and precise air-fuel control by replacing your worn or cracked factory breather assembly with a premium Burgaflex replacement.

Burgaflex Return Pipe - 11617504536 - E46, E39, E60, E83, E53 ...

Earn 5% back in Turner Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

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.

Vaico Oil Separator Valve - E38, E39

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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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Qty

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

Oil Separator Valve

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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

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Qty

$ 41.99

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

$ 31.99 USD

Limited Qty Sale

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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.

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Oil Separator Valve

5X Entries Into Our F80 M3 Sweepstakes Earn 5% back in Turner Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
5X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:22064593

Part#: AS826M-D851

Ships on Nov 19, 2026

$ 62.99 USD

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$ 62.99 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.

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Burgaflex N62 Crankcase Vent Hose (CCV) - Cylinders 1-4 - 11617547185...

Earn 5% back in Turner Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

T#:583521

Part#: 11617547185

Ships on Nov 20, 2026

$ 46.99 USD

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$ 46.99 USD

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Maintain peak engine efficiency and track-ready performance by replacing degraded PCV components with the Burgaflex crankcase vent hose.

Vaico Vacuum Pipe - BMW F22/23 F3X F07/10 F25/26 N20 N26 2.0L ...

Earn 5% back in Turner Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

T#:41492596

Part#: 11157603816

Special Order: No Guaranteed ETA

$ 28.99 USD

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$ 28.99 USD

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Eliminate vacuum leaks with this replacement vacuum pipe for your N20 / N26 powered BMW - Connects to the front passenger side of the N20 engine block

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Replacement (11)

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Oil Separation & Breather System
- CCV/PCV Breather Hoses (7)

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