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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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Genuine BMW - Corporate Logo
T#:178159
Part#: 11667603052
Ships in 1-2 days
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$ 68.99 USD
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$ 68.99 USD
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Genuine BMW Vacuum Pipe -
This item fits the following BMW Chassis:
F22,F30,F32,F33,F34,F36

Fits BMW Engines including:
N55

Bremmen Parts - Corporate Logo
T#:1195924
Part#: 11157575641
Ships in 1 day
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This product was last offered at the strikethrough price on
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$ 56.91 USD
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Replace your damaged crank vent pipe
Genuine BMW - Corporate Logo
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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Genuine BMW Vacuum Hose White - 2X4
This item fits the following BMW Chassis:
E30 M3,E34 M5,E46 M3,E30,E34,E46


Genuine BMW - Corporate Logo
T#:37164
Part#: 11667584945
Ships in 1-2 days
4% off MSRP $ 44.99

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$ 42.99 USD
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Genuine BMW Vacuum Pipe With Non-Return Valve -
This item fits the following BMW Chassis:
E71,F15,F16

Fits BMW Engines including:
N55


Turner Motorsport - Corporate Logo
T#:2895
Part#: 11617533400-E85
Back Ordered
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$ 386.64 USD
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This Crankcase Vent / Oil Separator Repair Kit includes the updated oil separator valve, oil dipstick guide tube and hoses. This kit fits E85 Z4 2.5i Z4 3.0i 2003-2005.

This item fits the following BMWs:
2003-2006 E85 BMW Z4 2.5i Z4 3.0i
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Genuine BMW - Corporate Logo
T#:58088
Part#: 32416753823
Ships in 1-2 days
2% off MSRP $ 174.99

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$ 170.99 USD
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Genuine BMW Return Pipe Dynamic Drive -
This item fits the following BMW Chassis:
E65


Genuine BMW - Corporate Logo
T#:35442
Part#: 11427808154
Ships in 1-2 days
5% off MSRP $ 397.99

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

$ 379.99 USD
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$ 397.99

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Genuine BMW Return Pipe -
This item fits the following BMW Chassis:
E70 X5

Fits BMW Engines including:
M57

Genuine BMW - Corporate Logo
T#:36013
Part#: 11537547171
Ships in 1-2 days
6% off MSRP $ 126.99

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

$ 119.99 USD
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Genuine BMW Return Pipe, Heater -
This item fits the following BMW Chassis:
E70 X5

Fits BMW Engines including:
N62N


Genuine BMW - Corporate Logo
T#:32270
Part#: 11157513756
Ships in 1-2 days
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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
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$ 148.91 USD
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Genuine BMW Vent Hose -
This item fits the following BMW Chassis:
E46

Fits BMW Engines including:
M56


Genuine BMW - Corporate Logo
T#:32278
Part#: 11157547820
Ships in 5 Business Days
4% off MSRP $ 71.99

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

$ 68.99 USD
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4% off MSRP
$ 71.99

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

$ 68.99 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

Genuine BMW - Corporate Logo
T#:35861
Part#: 11531406921
Ships in 1-2 days
3% off MSRP $ 224.99

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

$ 217.99 USD
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$ 224.99

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$ 217.99 USD
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Genuine BMW Return Pipe - Zyl. 5-8
This item fits the following BMW Chassis:
E39 M5,E39

Fits BMW Engines including:
S62

Genuine BMW - Corporate Logo
T#:37140
Part#: 11667551464
Ships in 1-2 days
4% off MSRP $ 71.99

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

$ 68.99 USD
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4% off MSRP
$ 71.99

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

$ 68.99 USD
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Genuine BMW Vacuum Pipe -
This item fits the following BMW Chassis:
E82

Fits BMW Engines including:
N51,N52N



Genuine BMW - Corporate Logo
T#:36425
Part#: 11611742324
Ships in 1-2 days
2% off MSRP $ 169.99

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

$ 166.99 USD
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$ 166.99 USD
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Genuine BMW Sound Absorber -
This item fits the following BMW Chassis:
E34

Fits BMW Engines including:
M60

Genuine BMW - Corporate Logo
T#:6679
Part#: 11151286257
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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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Genuine BMW - Corporate Logo
T#:36176
Part#: 11537838756
Ships in 1-2 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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$ 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


Genuine BMW - Corporate Logo
T#:36543
Part#: 11617560070
Ships in 1-2 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


Genuine BMW - Corporate Logo
T#:575977
Part#: 11151705272KT
Ships in 1-2 days
$ 171.99 USD
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$ 171.99 USD
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Oil Separator Kit | BMW E38 E39 M62 4.4L is designed to resolve common crankcase ventilation issues, ensuring optimal engine performance and reliability. BMW vehicles equipped with the M62 4.4L engine often experience oil separator failure, especially in cold weather, leading to excessive oil consumption, vacuum leaks, and potential engine damage. This complete kit replaces all critical components, preventing freezing and cracking caused by condensation buildup. Upgrading to a new oil separator system helps maintain proper oil vapor management, reducing the risk of oil leaks and performance issues.

  • Prevents common oil separator freezing and failure in cold weather
  • Helps eliminate excessive oil consumption and vacuum leaks
  • Direct-fit replacement for BMW E38 and E39 M62 4.4L engines
  • Includes all necessary components for a complete system overhaul
  • Restores proper crankcase ventilation for improved engine efficiency
  • Manufactured to meet or exceed OEM quality standards
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Genuine BMW - Corporate Logo
T#:35860
Part#: 11531406918
Ships in 1-2 days
3% off MSRP $ 224.99

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

$ 217.99 USD
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3% off MSRP
$ 224.99

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

$ 217.99 USD
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Genuine BMW Return Pipe - Zyl. 1-4
This item fits the following BMW Chassis:
E39 M5,E39

Fits BMW Engines including:
S62


Genuine BMW - Corporate Logo
T#:151009
Part#: 64221972010
Ships in 1-2 days
3% off MSRP $ 121.99

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

$ 117.99 USD
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3% off MSRP
$ 121.99

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

$ 117.99 USD
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Genuine BMW Breather Covering Rear
This item fits the following BMW Chassis:
E30 M3,E30

Bremmen Parts - Corporate Logo
T#:30629689
Part#: 11157532649
In Stock
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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Genuine BMW - Corporate Logo
T#:42058
Part#: 13531734196
Ships in 1-2 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
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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


Bremmen Parts - Corporate Logo
T#:640144
Part#: 13411733217
Back Ordered
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This product was last offered at the strikethrough price on
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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
Bremmen Parts - Corporate Logo
T#:48125821
Part#: 11127803790
Ships on Feb 26, 2027
New Item
Sale - Save 24% $ 15.99

This product was last offered at the strikethrough price on
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$ 12.23 USD
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$ 15.99

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$ 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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Oil Separator Valve
5X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
Hengst - Corporate Logo
T#:22064593
Part#: AS826M-D851
Ships on Sep 28, 2026
$ 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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Bremmen Parts - Corporate Logo
T#:51391238
Part#: 11127850244
Ships on Sep 28, 2026
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This product was last offered at the strikethrough price on
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$ 79.99 USD
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Bremmen Parts - Corporate Logo
T#:52586629
Part#: 11157603816
In Stock
New Item
Sale - Save 20% $ 29.99

This product was last offered at the strikethrough price on
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$ 23.99 USD
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$ 29.99

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$ 23.99 USD
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Febi - Corporate Logo
T#:38452821
Part#: 11157527570
Special Order: No Guaranteed ETA
$ 93.99 USD
$ 93.99 USD
For your BMW's optimal performance, ensure the functionality of the hose connecting the oil dipstick to the crankcase vent valve. Positioned below the intake manifold, this hose is susceptible to clogging with oil film and condensation, leading to potential failure over time. Cracks and swelling in old hoses can result in oil and vacuum leaks, compromising engine performance.
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Vaico - Corporate Logo
T#:41492596
Part#: 11157603816
Special Order: No Guaranteed ETA
$ 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

Packaged by Turner - Corporate Logo
T#:555304
Part#: 11157840446KT9
Ships in 1-2 days
$ 426.99 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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Packaged by Turner - Corporate Logo
T#:555305
Part#: 11157840446KT10
Ships in 1-2 days
$ 296.99 USD
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$ 296.99 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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Intake Manifold Cover (PCV)
We Price Match - Give Us A Call or Chat!
Meyle - Corporate Logo
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 Parts - Corporate Logo
T#:52551447
Part#: 11537806706
Ships on Sep 28, 2026
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Sale - Save 20% $ 129.99

This product was last offered at the strikethrough price on
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$ 103.99 USD
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$ 103.99 USD

Bremmen Parts - Corporate Logo
T#:1195923
Part#: 11157575640
In Stock
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This product was last offered at the strikethrough price on
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$ 49.41 USD
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$ 52.99

This product was last offered at the strikethrough price on
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$ 49.41 USD
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Replace your damaged crank vent pipe

Bremmen Parts - Corporate Logo
T#:53326231
Part#: 11617522933
In Stock
New Item
Sale - Save 20% $ 22.99

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

$ 18.39 USD
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This product was last offered at the strikethrough price on
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$ 18.39 USD
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Bremmen Parts - Corporate Logo
T#:53326230
Part#: 11158647299
In Stock
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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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$ 64.79 USD
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Kayser - Corporate Logo
T#:637518
Part#: 11667550007
Special Order: No Guaranteed ETA
$ 52.99 USD
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$ 52.99 USD
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"Cold Climate" Crankcase Pressure Regulator Valve
We Price Match - Give Us A Call or Chat!
Meyle - Corporate Logo
T#:35829339
Part#: 11617533400
Special Order: No Guaranteed ETA
$ 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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Rein - Corporate Logo
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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Genuine BMW - Corporate Logo
T#:577309
Part#: 11157840446KT5
Back Ordered
$ 613.99 USD
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$ 613.99 USD
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Packaged by Turner - Corporate Logo
T#:555308
Part#: 11151705237KT1
Back Ordered
Sale - Save 11% $ 208.99

This product was last offered at the strikethrough price on
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$ 186.75 USD
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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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Rein - Corporate Logo
T#:379791
Part#: 11151735150
Back Ordered
$ 5.23 USD
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$ 5.23 USD
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Part of the PCV system
URO - Corporate Logo
T#:373197
Part#: 11151730507
Back Ordered
$ 10.99 USD
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This tube runs from the valve cover breather connector to the reducer.

Rein - Corporate Logo
T#:6708
Part#: 11157556837
No longer available
No longer available
Over time, coolant hoses begin to get brittle and are susceptible to cracking and splitting. Replace your cracked or leaking coolant hose to prevent further leaks and potentially catastrophic failure.

This item fits the following BMWs:
BMW X Series - X5 4.4i, X5 4.6is

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URO - Corporate Logo
T#:373198
Part#: 11157556838
Ships in 1 Business Day
$ 13.99 USD
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Replacement oil separator vent hose that runs from the separator

URO - Corporate Logo
T#:362021
Part#: 11157556837
Ships in 1 Business Day
$ 8.04 USD
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This crankcase ventilation tube is found leading off the top outlet of the oil separator.

Packaged by Turner - Corporate Logo
T#:221962
Part#: TMS221962
Ships in 1-2 days
$ 458.99 USD
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The BMW N52 engine was deisgned with a crankcase vent system that relies on a heated oil separator valve to separate vapor from the liquid oil. Under ideal circumstances, the oil vapor would pass back into the intake and get burned up during normal combustion. The liquid oil would follow a path back down into the oil pan and be reused. This system is environmentally friendly but plagued with problems. The heating elements can fail or oil and carbon particles can block the oil separator valve. With no escape, the oil will continue to pool and collect in the valve cover or make its way into the combustion chamber leading to excessive oil consumption, blue smoke from the exhaust, idle and running issues. These issues are worse in colder climates where the freezing temperatures create an oil sludge condition that is impossible to clear. The plastic hoses can become brittle and crack which leads to vacuum leaks and oil leaks. Thankfully, the CCV is replaceable on the early N52 engines (2006 and some 2007 models) and should be inspected during a major service and any time the valve cover is off. Oil can also back up into the throttle body, which is easier to check than the oil separator itself. Later N52 engines do not have a serviceable oil vent as it is integrated into the valve cover and not a separate part.

This is a kit containing the oil separator, the vent hoses, and the intake manifold gaskets that are done during a typical oil separator replacement. Complete kit includes:
  • 11617531423, Genuine BMW oil separator
  • 11617559530, vent hose
  • 11157522931, oil separator hose
  • 11157567801, return hose
  • 11157537701, extraction hose
  • 11617547242, intake manifold gaskets (set of 6)
    The intake manifold must be removed to access the oil separator so new profile gaskets are included. We also recommend (but not required) a new oil separator fitting on the intake manifold because it's one of the heated elements that vaporizes the oil as it enters the intake.

    The oil separator can be replaced on its own but for a complete service we also recommend replacing the oil separator hoses and cleaning the valve cover. Any valve cover or intake manifold work should include a new oil separator valve.

    This kit fits the following BMWs:
    -10/2005 E90 BMW 325xi 330xi - Sedan
    -10/2005 E91 BMW 325xi - Wagon
    -10/2005 E60 BMW 525xi 530xi
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    Packaged by Turner - Corporate Logo
    T#:338253
    Part#: 11617531423KIT
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    Starting at $ 554.99 USD
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    Starting at $ 554.99 USD
    Free Shipping
    The BMW N52 engine was deisgned with a crankcase vent system that relies on a heated oil separator valve to separate vapor from the liquid oil. Under ideal circumstances, the oil vapor would pass back into the intake and get burned up during normal combustion. The liquid oil would follow a path back down into the oil pan and be reused. This system is environmentally friendly but plagued with problems. The heating elements can fail or oil and carbon particles can block the oil separator valve. With no escape, the oil will continue to pool and collect in the valve cover or make its way into the combustion chamber leading to excessive oil consumption, blue smoke from the exhaust, idle and running issues. These issues are worse in colder climates where the freezing temperatures create an oil sludge condition that is impossible to clear. The plastic hoses can become brittle and crack which leads to vacuum leaks and oil leaks. Thankfully, the CCV is replaceable on the early N52 engines (2006 and some 2007 models) and should be inspected during a major service and any time the valve cover is off. Oil can also back up into the throttle body, which is easier to check than the oil separator itself. Later N52 engines do not have a serviceable oil vent as it is integrated into the valve cover and not a separate part.

    This is a kit containing the oil separator, the vent hoses, and the intake manifold gaskets that are done during a typical oil separator replacement. Complete kit includes:
  • 11617531423, Genuine BMW oil separator
  • 11617559530, vent hose
  • 11157522931, oil separator hose
  • 11157567801, return hose
  • 11157537701, extraction hose
  • 11617547242, intake manifold gaskets (set of 6)
    The intake manifold must be removed to access the oil separator so new profile gaskets are included. We also recommend (but not required) a new oil separator fitting on the intake manifold because it's one of the heated elements that vaporizes the oil as it enters the intake.

    The oil separator can be replaced on its own but for a complete service we also recommend replacing the oil separator hoses and cleaning the valve cover. Any valve cover or intake manifold work should include a new oil separator valve.

    This kit fits the following BMWs:
    2006-2011 E90 BMW 325i 325xi 330i 330xi - Sedan
    2006-2012 E91 BMW 325xi - Wagon
    2006-2007 E60 BMW 525i 525xi 530i 530xi
    2006-2008 E85 BMW Z4 3.0i Z4 3.0si
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