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Oil Separation & Breather System

Oil Separation & Breather System for BMW Z3 (1996-2002)

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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 (48)

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Crankcase Ventilation Hose

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T#:378279

Part#: 11617533398

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$ 21.99 USD

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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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Upper Oil Separator Vent Tube

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T#:384805

Part#: 11611440317

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$ 20.30 USD

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$ 20.30 USD

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URO Crankcase Ventilation Hose - BMW M52TU M54

For vehicle with a production date from 09/1998

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T#:377307

Part#: 11157532649

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$ 12.99 USD

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From oil separator to dipstick tube

Hose - From Oil Separator to Oil Dipstick Tube - E46 E39

For use in cold climates

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T#:2879

Part#: 11157532629

In Stock at Vendor

$ 11.99

This product was last offered at the strikethrough price on
03-26-2026

$ 10.99 USD

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This is the updated hose that goes from the Crankcase Oil Separator Valve to the oil dipstick tube. This tube tends to get plugged with oil sludge and becomes brittle and cracks. It fits E46 323i 323ci 325i (M54) 325ci (M54) 325xi 328i 328ci 330i 330ci 330xi - E39 525i 530i - E60 525i 530i 2004-2005 - X3 2.5i 3.0i 2004-2006 - Z3 2.5i 3.0i - Z4 2.5i 3.0i 2003-2006.
In german, Rein means Pure. In the automotive industry the Rein name has quickly come to represent quality. With fitments for some of the world’s finest automobiles including BMW and Mini and guaranteed OE quality, Rein is a name you can trust.

This item fits the following BMWs:
2001-2005 E46 BMW 325i 325ci 325xi Only for cars with M54 engine
1999-2005 E46 BMW 323i 323ci 328i 328ci 330i 330ci 330xi
2001-2003 E39 BMW 525i 530i
2004-2005 E60 BMW 525i 525xi 530i 530xi
2004-2006 E83 BMW X3 2.5i X3 3.0i
2001-2002 Z3 BMW Z3 2.5i Z3 3.0i
2003-2005 Z4 BMW Z4 2.5i Z4 3.0i

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Return Pipe - E46, Z3, Z4

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T#:36176

Part#: 11537838756

Ships in 4 Business Days

1% off MSRP $ 587.99

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

$ 583.99 USD

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1% off MSRP

$ 587.99

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

$ 583.99 USD

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Genuine BMW Return Pipe
This item fits the following BMW Chassis:
E46 M3,E85 Z4M,E46,E85 Z4,E86 Z4

Fits BMW Engines including:
S54

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

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T#:149270

Part#: 64111368684

Ships in 2 Business Days

8% off MSRP $ 12.99

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

$ 11.99 USD

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8% off MSRP

$ 12.99

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

$ 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

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

For vehicles with production date from 09/1998

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T#:359420

Part#: 11157532649

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$ 11.99 USD

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ENGINE VENT HOSE 11157532649

Bremmen Mounting Grommet Seal - BMW E36 E39 Z3 E34 E38

Up to Model Year 09/1998

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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

This product was last offered at the strikethrough price on
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

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Oil Separation & Breather System
- CCV/PCV Breather Hoses (48)

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