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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.

This category contains parts that fit the following chassis:

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CCV/PCV Breather Hoses (161)

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Valve Cover Vent Hose - E30 325e 325i E28 528e E34 525i

2X Entries Into Our F80 M3 Sweepstakes

T#:6692

Part#: 11151708801

In Stock

$ 18.99

This product was last offered at the strikethrough price on
06-04-2026

$ 10.17 USD

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$ 10.17 USD

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This is the engine PCV vent hose that connects to the valve cover. A cracked hose can lead to rough idle and poor running. Replace your dry or cracked hose today.1987-1991 E30 BMW 318i 318is 318ic 325e 325es 325i 325ic 325is 325ix M3
12/1986-1988 E28 BMW 524td 528e 533i 535i 535is M5
1989-1990 E34 BMW 525i

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Burgaflex Crankcase Vent Hose - Vent Valve to Oil Dip Stick Tube - E3...

T#:596606

Part#: 11157532649

Ships in 3 Business Days

$ 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 Crankcase Vent Pipe - Return Pipe from Connecting Hose - E3...

T#:596611

Part#: 11617504536

Ships in 3 Business Days

$ 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.

Vent Hose - Crankcase-Ventilation / Oil Separator

T#:57725180

Part#: 11151740393

Ships in 3 Business Days

$ 5.99 USD

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Qty

$ 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.

Crankcase Ventilation Connecting Pipe - Cylinders 1-4

T#:57725182

Part#: 11157646086

Ships in 3 Business Days

$ 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.

Engine Breather Hose

T#:57725177

Part#: 11157522931

Ships in 3 Business Days

$ 52.99 USD

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Qty

$ 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.

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

2X Entries Into Our F80 M3 Sweepstakes

T#:359420

Part#: 11157532649

In Stock

$ 11.99 USD

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Qty

$ 11.99 USD

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ENGINE VENT HOSE 11157532649

Vacuum Hose - E38

T#:36543

Part#: 11617560070

Ships in 7 Business Days

4% off MSRP $ 23.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 22.99 USD

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4% off MSRP

$ 23.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 22.99 USD

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Genuine BMW Hose -
This item fits the following BMW Chassis:
E38

Fits BMW Engines including:
M62

Breather Hose - E21

T#:6679

Part#: 11151286257

Ships in 7 Business Days

$ 8.99 USD

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$ 8.99 USD

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Genuine BMW ENGINE HOSE 11151286257.--

This item fits the following BMWs:
BMW 3 Series - 320i

--.

Fits BMW Engines including:
M10

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Return Pipe - E30

T#:42058

Part#: 13531734196

Ships in 7 Business Days

3% off MSRP $ 31.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 30.99 USD

Add to Wish List

Qty

3% off MSRP

$ 31.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 30.99 USD

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Genuine BMW Return Pipe -
This item fits the following BMW Chassis:
E30

Fits BMW Engines including:
M42

Vacuum Pipe - E82, E88, E90, E92, E93

T#:32278

Part#: 11157547820

Special Order: No Guaranteed ETA

4% off MSRP $ 79.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 76.99 USD

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Qty

4% off MSRP

$ 79.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 76.99 USD

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Genuine BMW Vacuum Pipe -
This item fits the following BMW Chassis:
E82,E90,E92,E93

Fits BMW Engines including:
N51

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!

T#:22064593

Part#: AS826M-D851

Ships on Oct 21, 2026

$ 62.99 USD

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Qty

$ 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 Crankcase Vent Hose - Cylinders 1-4 - E53 E63 E64 E65 E60 E...

T#:583521

Part#: 11617547185

Ships on Oct 22, 2026

$ 46.99 USD

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Qty

$ 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.

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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Qty

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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E70 Return Pipe

10X Entries Into Our F80 M3 Sweepstakes

T#:52551447

Part#: 11537806706

In Stock

Sale - Save 20% $ 129.99

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

$ 103.99 USD

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Qty

Sale - Save 20%

$ 129.99

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

$ 103.99 USD

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

T#:41492596

Part#: 11157603816

Special Order: No Guaranteed ETA

$ 28.99 USD

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Qty

$ 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

Intake Manifold Cover (PCV)

5X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!

T#:594546

Part#: 11617501562

Ships on Oct 15, 2026

$ 55.99 USD

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Qty

$ 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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Crank Case Ventilation Valve - Priced Each

10X Entries Into Our F80 M3 Sweepstakes

T#:53326230

Part#: 11158647299

In Stock

Sale - Save 20% $ 80.99

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

$ 64.79 USD

Add to Wish List

Qty

Sale - Save 20%

$ 80.99

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

$ 64.79 USD

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Suction Jet Pump W/ Lines

T#:637518

Part#: 11667550007

Special Order: No Guaranteed ETA

$ 52.99 USD

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Qty

$ 52.99 USD

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Bremmen Mounting Grommet Seal - BMW E36 E39 Z3 E34 E38

10X Entries Into Our F80 M3 Sweepstakes

T#:640144

Part#: 13411733217

Back Ordered

$ 10.99 USD

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Qty

$ 10.99 USD

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This grommet is located on the back side of the PCV or idle control valve

"Cold Climate" Crankcase Pressure Regulator Valve

5X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!

T#:35829339

Part#: 11617533400

Back Ordered

$ 69.99 USD

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Qty

$ 69.99 USD

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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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Crankcase Ventilation Tube

2X Entries Into Our F80 M3 Sweepstakes

T#:362021

Part#: 11157556837

Ships in 2 Business Days

$ 8.04 USD

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Qty

$ 8.04 USD

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This crankcase ventilation tube is found leading off the top outlet of the oil separator.

URO Oil Separator Vent Hose - BMW E53 E52 M62 N62 S62

2X Entries Into Our F80 M3 Sweepstakes

T#:373198

Part#: 11157556838

Ships in 2 Business Days

$ 13.99 USD

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Qty

$ 13.99 USD

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Replacement oil separator vent hose that runs from the separator

Rein Crankcase Vent Hose - E34

2X Entries Into Our F80 M3 Sweepstakes

T#:379791

Part#: 11151735150

Back Ordered

$ 5.23 USD

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Qty

$ 5.23 USD

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Part of the PCV system

Crankcase Ventilation Hose

2X Entries Into Our F80 M3 Sweepstakes

T#:373197

Part#: 11151730507

Back Ordered

$ 10.99 USD

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Qty

$ 10.99 USD

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This tube runs from the valve cover breather connector to the reducer.

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Oil Separation & Breather System
- CCV/PCV Breather Hoses (161)

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