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Oil Separation & Breather System for BMW 3 Series E91 (2006-2012)

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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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Bremmen Crankcase Vent Hose - E60 E70 E82/88 E9X N52 3.0L

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T#:640155

Part#: 11157559528

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05-03-2026

$ 39.16 USD

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This valve cover vent hose helps to vent the crankcase fumes on BMW's with the N51 / N52 6 cylinder engines. If replacing the valve cover, we recommend purchasing this item as well as it often will break while removing it from the valve cover.

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Extraction Line

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T#:30629688

Part#: 11157537701

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Sale - Save 21% $ 28.99

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

$ 22.84 USD

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Oil Separator Vent Hose

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T#:33746535

Part#: 11617559530

Ships on Oct 20, 2026

Sale - Save 20% $ 42.99

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05-03-2026

$ 34.26 USD

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Oil Separator Valve

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T#:8677203

Part#: 11617531423

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Sale - Save 4% $ 69.99

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05-03-2026

$ 67.20 USD

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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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$ 48.99 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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$ 44.99

This product was last offered at the strikethrough price on
08-23-2026

$ 38.99 USD

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

Rein Crankcase Ventilation Hose - E60, E61, E90, E91

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T#:591594

Part#: 11157567802

Ships in 4 Business Days

$ 74.99 USD

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From oil separator to oil pan vent tube

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

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T#:13029

Part#: 11617559530

Ships in 4 Business Days

$ 66.99

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

$ 43.99 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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Bremmen Parts O Ring

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T#:558205

Part#: 11617533329

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05-03-2026

$ 4.89 USD

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Seals the PCV angle connector to the intake manifold

Oil Separator Valve

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T#:594299

Part#: 11617531423

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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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OEM Rein Oil Separator Vent Hose - E60/1 E90/1 N52

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T#:402020

Part#: 11617522933

Ships in 2 Business Days

$ 19.99 USD

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$ 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.

Oil Separator Vent Hose

10X Entries Into Our F80 M3 Sweepstakes

T#:53326231

Part#: 11617522933

In Stock

Sale - Save 15% $ 23.99

This product was last offered at the strikethrough price on
09-16-2026

$ 20.39 USD

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This product was last offered at the strikethrough price on
09-16-2026

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Replacement (12)

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

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