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Oil Separation & Breather System

Oil Separation & Breather System for BMW 5 Series E34 (1987-1995)

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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 (10)

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BMW Oil Separator Valve | M60 3.0 / 4.0L

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T#:39059261

Part#: 11151747066

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$ 31.99 USD

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BMW Oil Separator Valve | M60 3.0 / 4.0L is a vital component that ensures proper crankcase ventilation by separating oil vapors from blow-by gases, preventing excessive oil consumption and maintaining engine efficiency. Designed for BMW models equipped with the M60 3.0L and 4.0L engines, this oil separator valve helps reduce carbon buildup and extends the life of essential engine components. For optimal results, it is recommended to replace the valve cover and crankcase ventilation system (CCV) when changing the separator valve.

Effectively separates oil vapors to prevent excessive oil consumption
Helps maintain proper crankcase ventilation for optimal engine performance
Reduces carbon buildup and prolongs engine longevity
Direct-fit replacement for BMW M60 3.0L and 4.0L engines
High-quality materials ensure durability and resistance to engine heat
Recommended to replace valve cover and CCV for complete system maintenance

Ensure the longevity and efficiency of your BMW engine by replacing a worn oil separator valve with this high-quality replacement.

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Intake Manifold Cover (PCV)

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T#:373047

Part#: 11617501562

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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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Genuine BMW Intake Manifold Cover (PCV)

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T#:19248

Part#: 11617501562

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3% off MSRP $ 87.99

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$ 84.99 USD

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$ 87.99

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Genuine BMW ENGINE COVER WITH NON-RETURNVALVE

ECS Tuning Baffled Oil Catch Can - 8oz

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T#:13496655

Part#: 003779ECS05-02

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$ 222.11 USD

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Upgrade Your BMW with ECS Baffled Oil Catch Can

Modern emission regulations require a closed PCV/Breather system for cleaner operation. However, inefficient oil particle capture can lead to excessive oil vapor ingestion, causing carbon buildup, reduced performance, and fuel economy. ECS Tuning's updated ECS Baffled Oil Catch Can, now with an easy-to-empty 1/4" drain fitting, is engineered to collect toxic blow-by gases, minimize carbon deposits, and reduce oil contamination within engine oil. Recirculating oil vapor ensures emissions compliance without venting to the atmosphere.

Key Features:
Highly Efficient Oil Separator: Strategically positioned 4 chamber baffle system maximizes oil/air separation and minimizes oil droplets in the intake tract.
Integrated Dipstick: Knurled and black anodized oil dipstick simplifies oil volume inspection.
Reservoir: Available in 6oz or 8oz capacity with a 1/4" NPT drain plug fitting.
Serviceable: Easily removable baffle plates and drain plug for cleaning.
Easy/Customizable Installation: Combine with the ECS Universal Bracket Kit for simplified installation and adjustable mounting locations.
Leak-Free Fittings: Machined -10AN ORB (O-Ring Boss) fittings available for secure connections (fittings sold separately).

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Genuine BMW CCV Connector

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T#:32260

Part#: 11151747976

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$ 44.99 USD

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Genuine BMW Connector -
This item fits the following BMW Chassis:
E34,E38,E39

Fits BMW Engines including:
M60,M62

Genuine BMW Idle Speed Control Hose

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T#:367818

Part#: 13411710793

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$ 58.99 USD

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$ 60.99

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Bav Auto Intake Manifold Cover w/ PCV Valve - BMW E31 E32 E34 E38 M6...

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T#:639843

Part#: 11617501562

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$ 50.99 USD

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An integral part of the emissions system, the PVC valve lets the crankcase 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. From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty.

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Profile-gasket 11611729728

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T#:18889

Part#: 11611729728

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$ 4.99

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04-06-2026

$ 4.07 USD

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PROFILE-GASKET 11611729728 Manufactured by Reinz

Genuine BMW Mounting Grommet

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T#:360723

Part#: 13411733217

Ships on Jun 8, 2026

$ 17.86 USD

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3 Pin Connector

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T#:33412930

Part#: 12521706096

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$ 9.78 USD

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Includes connector housing with terminals and seals. Commonly used for the idle air control valve (IACV).

ECS Tuning replacement harness connectors include all necessary pins and wire seals for a complete harness repair. Whether you have a broken harness connector or need a complete wiring repair, we have the components you need.

Each connector includes an additional terminal in case one becomes lost or damaged during installation.

*OEM cross reference PN# 12521706096 - Commonly used for the idle air control valve (IACV).

Please reference the original part number from the existing connector to confirm fitment, before ordering.

Suggested tools:

Suggested crimping pliers: T#387193
Wire De-pin tools:
12pc De-Pin Tool Set - T#386379
23pc De-Pin Tool Set - T#641943

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Victor Reinz O-Ring - E32, E34, E38, E39

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T#:592731

Part#: 07119906360

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$ 3.99

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05-07-2026

$ 2.99 USD

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If this gasket fails it can cause oil leaks and other issues. Replace it at any sign of failure!

Elring Crank Case Vent Valve Gasket - M60 M62

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T#:362757

Part#: 11611729728

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$ 7.13

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06-03-2026

$ 6.11 USD

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This gasket seals the PCV valve to the valve cover. If this leaks, you maybe experience poor running conditions or check engine lights. Replace your leaking seal with a new Elring gasket to ensure long lasting reliability.

Elring is one of the biggest OEM names in the manufacturing of high quality gaskets that are available for very affordable prices. Elring has supplied many automotive names for years with the gaskets that seal your car's components from day 1 so you can rest assured that these components will last for a long time to come!

Fits the following BMW engines:
M60 3.0L 4.0L
M62 4.4L

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Febi Crankcase Ventilation Hose - E34

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T#:381678

Part#: 11151708801

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$ 11.99

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05-07-2026

$ 9.99 USD

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Prone to cracking and breaking.

Victor Reinz Oil Separator O-Ring - E31, E32, E34, E38, E39 ...

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T#:19104

Part#: 11151747978

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$ 5.69

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06-05-2026

$ 5.65 USD

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O-RING 11151747978 Manufactured by Reinz

Crankcase Ventilation Hose

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T#:373085

Part#: 11151708801

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$ 8.03 USD

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The rubber breather pipes used a number of BMW applications are prone to cracking. Over the years, the engine heat and weather can take their toll and either weaken or cause breaks in these hoses. Your engine begins to run much worse due to massive vacuum leaks.

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Vacuum Hose - E24, E28, E3, E30, E32, E34, E46, Z3

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T#:149270

Part#: 64111368684

Ships in 1-2 days

8% off MSRP $ 12.99

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$ 11.99 USD

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$ 12.99

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$ 11.99 USD

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Genuine BMW Vacuum Hose White - 2X4
This item fits the following BMW Chassis:
E30 M3,E34 M5,E46 M3,E30,E34,E46

Kayser Oil Separator O-Ring - E31, E32, E34, E38, E39

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T#:1195920

Part#: 11151747978

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$ 5.99

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$ 4.99 USD

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Seals the vent pipe to the oil separator

Genuine BMW Sound Absorber - 11611742324 - E34

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T#:36425

Part#: 11611742324

Ships in 7 Business Days

2% off MSRP $ 169.99

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$ 165.99 USD

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2% off MSRP

$ 169.99

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$ 165.99 USD

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Genuine BMW Sound Absorber -
This item fits the following BMW Chassis:
E34

Fits BMW Engines including:
M60

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

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T#:6692

Part#: 11151708801

Ships in 6 Business Days

$ 18.99

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

$ 9.17 USD

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$ 9.17 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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Intake Manifold Cover (PCV)

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T#:594546

Part#: 11617501562

Special Order: No Guaranteed ETA

$ 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 Mounting Grommet Seal - BMW E36 E39 Z3 E34 E38

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T#:640144

Part#: 13411733217

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05-03-2026

$ 8.25 USD

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

Rein Crankcase Vent Hose - E34

For vehicles with a production date from 09/1990

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T#:379791

Part#: 11151735150

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Part of the PCV system

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Oil Separation & Breather System
- CCV/PCV Breather Hoses (10)

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