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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 (198)

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Turner Emissions Service Kit - E46 M3

10X Entries Into Our F80 M3 Sweepstakes

T#:555305

Part#: 11157840446KT10

Ships in 2 Business Days

$ 296.99

This product was last offered at the strikethrough price on
08-26-2026

$ 290.99 USD

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$ 290.99 USD

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The hoses and oil separator can crack or become faulty, leading to vacuum leaks or oil leaks. This is caused by the stress the plastic components are exposed to during heating and cooling cycles, especially if the vehicle is not brought up to operating temperature during driving in cold weather climates.

This kit includes the needed hoses, oil separator, and hardware.

Fits the following BMWs:
2001-09/2004 E46 BMW M3 - Manual Transmission

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Turner Emissions Service Kit - E46 M3

10X Entries Into Our F80 M3 Sweepstakes

T#:555304

Part#: 11157840446KT9

Ships in 2 Business Days

$ 426.99

This product was last offered at the strikethrough price on
08-26-2026

$ 420.99 USD

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$ 420.99 USD

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The hoses and oil separator can crack or become faulty, leading to vacuum leaks or oil leaks. This is caused by the stress the plastic components are exposed to during heating and cooling cycles, especially if the vehicle is not brought up to operating temperature during driving in cold weather climates.

This kit includes the needed hoses, oil separator, and hardware.

Fits the following BMWs:
09/2004-2006 E46 BMW M3 - Manual Transmission

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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 Sep 22, 2026

$ 55.99 USD

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$ 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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Bremmen Parts Crankcase Vent Pipe - Cylinders 1-4 - E70, E71, F01, F0...

10X Entries Into Our F80 M3 Sweepstakes

T#:1195923

Part#: 11157575640

In Stock

Sale - Save 7% $ 52.99

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

$ 49.41 USD

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Sale - Save 7%

$ 52.99

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

$ 49.41 USD

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Replace your damaged crank vent pipe

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

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Sale - Save 20%

$ 80.99

This product was last offered at the strikethrough price on
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$ 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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$ 52.99 USD

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Crankcase Ventilation Hose

2X Entries Into Our F80 M3 Sweepstakes

T#:373197

Part#: 11151730507

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$ 10.99 USD

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$ 10.99 USD

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

Bremmen Mounting Grommet Seal - BMW E36 E39 Z3 E34 E38

10X Entries Into Our F80 M3 Sweepstakes

T#:640144

Part#: 13411733217

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Sale - Save 17% $ 9.99

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

$ 8.25 USD

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Sale - Save 17%

$ 9.99

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$ 8.25 USD

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

Turner Oil Separator Kit - E53 X5 M62 4.4L 4.6L

10X Entries Into Our F80 M3 Sweepstakes

T#:555308

Part#: 11151705237KT1

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Sale - Save 11% $ 208.99

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

$ 186.75 USD

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Sale - Save 11%

$ 208.99

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

$ 186.75 USD

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The rubber hoses and oil separator can crack or become faulty, leading to vacuum leaks or oil leaks. This is caused by the stress the components are exposed to during heating and cooling cycles, especially if the vehicle is not brought up to operating temperature during driving in cold weather climates.

This kit includes the needed hoses, oil separator, and hardware.

Fits the following BMWs:
1999-2006 E53 BMW with M62 4.4L 4.6L

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Rein Crankcase Vent Hose - E34

2X Entries Into Our F80 M3 Sweepstakes

T#:379791

Part#: 11151735150

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Sale - Save 5% $ 5.23

This product was last offered at the strikethrough price on
08-31-2026

$ 4.97 USD

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Sale - Save 5%

$ 5.23

This product was last offered at the strikethrough price on
08-31-2026

$ 4.97 USD

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Part of the PCV system

Crankcase Ventilation Tube

2X Entries Into Our F80 M3 Sweepstakes

T#:362021

Part#: 11157556837

Ships in 1 Business Day

$ 8.04 USD

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$ 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 1 Business Day

$ 13.99 USD

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$ 13.99 USD

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Replacement oil separator vent hose that runs from the separator

"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

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$ 69.99 USD

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$ 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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Genuine BMW Emissions Service Kit - E46 M3

T#:577309

Part#: 11157840446KT5

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$ 613.99 USD

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$ 613.99 USD

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- CCV/PCV Breather Hoses (198)

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