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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 (32)

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Cold Climate Oil Separator Kit - Level 2

10X Entries Into Our F80 M3 Sweepstakes

T#:15744065

Part#: 114317400450-KT

In Stock

Sale - Save 41% $ 231.99

This product was last offered at the strikethrough price on
06-15-2026

$ 137.46 USD

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Sale - Save 41%

$ 231.99

This product was last offered at the strikethrough price on
06-15-2026

$ 137.46 USD

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If you are ready to perform a truly complete oil separator system service, our Level 2 kit provides you with all of our Level 1 kit components plus a throttle body gasket, throttle body inlet boot, ICV grommet, and dipstick tube o-ring. Our Level 2 Cold Climate kit includes the following: Oil separator - BMW cold climate recommended Hose from oil separator to dipstick tube - BMW cold climate recommended Hose from oil separator to valve cover Hose from intake manifold back to the connector hose Hose from oil separator up to the intake manifold Throttle body gasket Throttle body inlet boot ICV rubber grommet Oil dipstick tube o-ring seal It is highly recommended to replace the oil dipstick tube with the updated design by BMW as this also a common place for sludge to build up.

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Bremmen Parts O Ring

10X Entries Into Our F80 M3 Sweepstakes

T#:558205

Part#: 11617533329

In Stock

Sale - Save 30% $ 6.99

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

$ 4.89 USD

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$ 6.99

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

$ 4.89 USD

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Seals the PCV angle connector to the intake manifold

Bremmen Parts Crankcase Vent Pipe - Cylinders 5-8 - E70, E71, F01, F0...

10X Entries Into Our F80 M3 Sweepstakes

T#:1195924

Part#: 11157575641

Ships in 1 day

Sale - Save 10% $ 63.23

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

$ 56.91 USD

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Sale - Save 10%

$ 63.23

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

$ 56.91 USD

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Replace your damaged crank vent pipe

Crankcase Ventilation Valve

10X Entries Into Our F80 M3 Sweepstakes

T#:48125821

Part#: 11127803790

Ships on Feb 24, 2027

Sale - Save 24% $ 15.99

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

$ 12.23 USD

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Sale - Save 24%

$ 15.99

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05-03-2026

$ 12.23 USD

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Ensure your BMW engine runs clean and efficiently with this Crankcase Breather Valve Diaphragm Spring and Cap (11127803790).

A direct-fit replacement for the original BMW breather (OE 11127803790 / 11-12-7-803-790), this valve maintains proper crankcase pressure, reduces oil buildup, and promotes smooth engine performance.

Constructed from durable, high-quality materials and engineered to OEM specifications, it installs easily without any modifications.

Ideal for maintenance, resolving crankcase pressure issues, or restoring your engine’s ventilation system, this breather valve delivers reliable performance and helps protect your BMW for years to come.

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Genuine BMW Vent Hose - E46 325Ci, E46 325i

T#:32270

Part#: 11157513756

Ships in 1 day

Sale - Save 16% $ 177.99

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

$ 148.91 USD

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This product was last offered at the strikethrough price on
05-14-2026

$ 148.91 USD

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Genuine BMW Vent Hose -
This item fits the following BMW Chassis:
E46

Fits BMW Engines including:
M56

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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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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$ 103.99 USD

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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

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$ 80.99

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

10X Entries Into Our F80 M3 Sweepstakes

T#:555308

Part#: 11151705237KT1

Back Ordered

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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$ 208.99

This product was last offered at the strikethrough price on
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$ 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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Oil Separation & Breather System
- CCV/PCV Breather Hoses (32)

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