Oil Separation & Breather System

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

T#:592731

Part#: 07119906360

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

Engine Vent Hose 11151740393

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T#:6703

Part#: 11151740393

Ships on Oct 5, 2026

$ 5.89 USD

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ENGINE VENT HOSE 11151740393

Oil Separator Valve

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T#:22064588

Part#: AS819M

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$ 41.99

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05-03-2026

$ 31.99 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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Bav Auto Upper Oil Separator Vent Tube - E36 E46 E60 E84 Z3 Z4 M54 M5...

T#:640502

Part#: 11617504535

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$ 19.99 USD

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Runs from the top of the oil separator up to rear of the intake manifold. 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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Oil Separator Kit - Level 1

T#:15710823

Part#: E46M5411_61KT

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05-03-2026

$ 93.71 USD

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Replace all the components of the oil separator system together to prevent damage to all the aspects of your engine. As long as you have everything off, you can rest assured that new parts will last and be reliable. 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. ur Level 1 kit includes the following; Oil separator Hose from oil separator to dipstick tube 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

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Rein PCV Hose - E36, Z3

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T#:379766

Part#: 11151740393

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$ 9.99

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03-24-2026

$ 7.19 USD

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Attaches the PCV to the oil dipstick tube

Oil Separator - Crankcase Ventilation System

T#:8741202

Part#: 11151705272B

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05-03-2026

$ 19.07 USD

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BMW has an issue with oil separators freezing in cold weather if the engine is not fully warmed up during driving. Common symptoms are a howling noise followed by oil leaks. Crankcase breather valve used to purge the oil vapor from the engine block into the valve cover. This valve has 4 hoses connected to it, running to dipstick, valve cover, air intake.

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Intake Manifold Rubber Grommet 13411733217

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T#:7203

Part#: 13411733217

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$ 12.65 USD

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FUEL PREPARATION INTAKE MANIFOLD RUBBER GROMMET 13411733217

Vaico Oil Separator Valve - E38, E39

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T#:363292

Part#: 11151705272

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05-02-2026

$ 23.87 USD

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Connects to the vent tube which is attached to the PCV valve

Oil Separator - Crankcase Ventilation System

T#:8741203

Part#: 11151705237

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$ 6.30 USD

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Critical crankcase ventilation cyclone separator - great replacement or custom install! Failure of the oil separator commonly causes problems related to smoking or a check engine light. Featuring an approximately ¾” air inlet/outlet and ½” oil drain outlet, this oil separator/CCV commonly found in custom installations on many vehicles.

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Bremmen Parts O Ring

T#:558205

Part#: 11617533329

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$ 4.89 USD

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Seals the PCV angle connector to the intake manifold

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

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T#:2879

Part#: 11157532629

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$ 11.99

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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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Crankcase Ventilation Dipstick Hose - BMW M52TU M54

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T#:359570

Part#: 11157532629

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$ 12.99 USD

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This tube runs from the oil separator to the lower dipstick tube.

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.

Replace this and all the other components of the oil separator system to prevent damage to all the aspects of your engine. As long as you have everything off, you can rest assured that new parts will last and be reliable.

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BMW Breather Valve

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T#:17339405

Part#: 11127537733

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$ 27.99

This product was last offered at the strikethrough price on
05-29-2026

$ 19.99 USD

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Are you experiencing a slight loss of power? This pressure regulator valve repair kit could easily be the culprit. With a bad gasket or weak spring you could be losing pressure, resulting in less power.

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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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PCV Adapter Fitting N54

T#:557961

Part#: VTT-PCV-ADAPTER

Ships in 10 Business Days

$ 145.99 USD

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Vargas Turbo has you covered when you are installing a custom turbo setup. With all of the adapters you need and all the valves necessary, the only real limiting factor is your imagination!

This is the adapter fitting that is required to convert your N54 to external PCV if you want to keep your crankcase under vacuum at idle, and anytime you have a vacuum condition in your intake manifold. They are made from 6061-T6 with black anodizing for a long-lasting finish. Includes complete adapter, with all o-rings, and retaining clip.

This must be used in conjunction with the Vargas billet check valve, and PCV delete fitting or requires plugging of the intake PCV ports. Installs inline on the throttle body, and adds a -8AN male to adapt to a catch cans, or any custom set up.

Made from 6061-T6 with black anodizing for a long-lasting finish. Includes complete adapter, with all o-rings, and retaining clip

This part fits the following BMW engines:
2006-2012 N54

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URO Crankcase Ventilation Hose - BMW M52TU M54

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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

Oil Separator kit - N63

T#:56291074

Part#: 11158636540KT2

Ships in 3 Business Days

$ 429.67 USD

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If your BMW is burning oil, showing unmetered air faults, or suffering from degraded throttle response, a compromised breather system is usually the culprit. The N63 Crankcase Breather Package pairs Genuine BMW oil separators with OE tier Rein connecting pipes. Designed to restore factory level oil separation and sealed vacuum integrity across both cylinder banks

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Return Pipe

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T#:372847

Part#: 11617504536

Ships in 1 Business Day

$ 16.99 USD

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Runs from the intake manifold back to connecting hose

Crankcase Ventilation Hose

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T#:379684

Part#: 11151730507

Ships in 3 Business Days

$ 9.99 USD

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From valve cover breather connector to reducer

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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Rein Return Pipe - E39, E46, E53, E60, E83, Z3, Z4

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T#:375092

Part#: 11617504536

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$ 19.99 USD

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Runs from the intake manifold back to connecting hose

Crankcase Ventilation Connecting Pipe - Cylinders 5-8

T#:50626659

Part#: 11157646087

Ships in 1 Business Day

$ 59.99 USD

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"Cold Climate" Crankcase Pressure Regulator Valve

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T#:376770

Part#: 11617533400

Ships in 1 Business Day

$ 70.99

This product was last offered at the strikethrough price on
04-10-2026

$ 40.99 USD

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Commonly referred to as the "oil separator" or PCV

OEM Rein Oil Separator Vent Hose - E60/1 E90/1 N52

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T#:402020

Part#: 11617522933

Ships in 1 Business Day

$ 19.99 USD

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If your BMW has a damaged vent hose, be sure to replace it to restore functionality of this rather important emissions system.

Pressure Regulator Valve Repair Kit

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T#:600041

Part#: 11127547058

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$ 14.99 USD

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Crankcase Vent Hose - Cylinders 5-8

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T#:384972

Part#: 11617547186

Ships in 3 Business Days

$ 59.99 USD

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Should be replaced anytime leaks are detected

URO PCV Valve - Left Cylinder Bank - BMW N73 6.0L

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T#:592794

Part#: 11157563505

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$ 30.99 USD

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When the crankcase vent valve fails it can cause excessive oil consumption, engine fault codes and poor idle.

Oil Separator Valve

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T#:594299

Part#: 11617531423

Ships in 3 Business Days

$ 120.81 USD

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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.

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

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T#:6707

Part#: 11157532649

Ships in 1 Business Day

$ 19.12

This product was last offered at the strikethrough price on
05-29-2026

$ 17.19 USD

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ENGINE VENT HOSE 11157532649

Crankcase Vent Hose - From Valve Cover to Oil Separator - E46 E39 E6...

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T#:2853

Part#: 11611432559

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$ 14.99 USD

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This Crankcase Vent Hose - From Valve Cover to Oil Separator fits BMWs with the M52 or M54 6 cylinder engine including E46 323i 325i 328i 330i E39 525i 528i 530i E60 525i 530i X3 2.5i 3.0i X5 3.0i Z3 2.5 2.8 3.0i Z4 2.5i 3.0i.

This item fits the following BMWs:
1999-2005 E46 BMW 323i 323ci 328i 328ci 330i 330ci 330xi
1999-2005 E46 BMW 325i 325ci 325xi - only with M54 engine
1999-2003 E39 BMW 528i 528i 530i
2004-2005 E60 BMW 525i 525xi 530i 530xi
2004-2006 E83 BMW X3 2.5i X3 3.0i
2000-2006 E53 BMW X5 3.0i
1999-2002 Z3 BMW Z3 2.3 Z3 2.5i Z3 2.8i Z3 3.0i
2003-2006 E85 BMW Z4 2.5i Z4 3.0i

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

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T#:359557

Part#: 11157532629

Ships in 1 day

$ 23.99

This product was last offered at the strikethrough price on
08-13-2026

$ 15.99 USD

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From oil separator to dipstick tube

Upper Oil Separator Vent Tube

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T#:384805

Part#: 11611440317

Ships in 3 Business Days

$ 20.30 USD

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BMW Oil Separator Valve | E38 E39 540i 740i 740iL M62 4.4L Engine ...

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T#:39059263

Part#: 11151705272

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$ 25.00 USD

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BMW Oil Separator Valve | E38 E39 540i 740i 740iL M62 4.4L Engine is an essential component designed to maintain optimal engine performance by purging oil vapors from the engine block into the valve cover. This valve features four hoses connecting it to the dipstick, valve cover, and air intake system, ensuring efficient crankcase ventilation. BMW engines, especially in colder climates, are known to experience issues with oil separators freezing if the engine isn't properly warmed up, leading to symptoms such as howling noises followed by oil leaks.

Effectively purges oil vapors from the engine block to maintain clean operation
Designed for BMW E38 and E39 models with M62 4.4L engine
Helps prevent oil separator freezing in cold weather conditions
Features four hoses connected to the dipstick, valve cover, and air intake for optimal ventilation
Reduces engine sludge buildup, preventing potential damage and maintaining efficiency
Durable construction to withstand high temperatures and the demands of the engine

Replace a worn oil separator valve to maintain the proper ventilation and efficiency of your BMW engine, preventing oil leaks and other performance issues.

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Crankcase Vent Hose - Cylinders 1-4

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T#:384973

Part#: 11617547185

Ships in 3 Business Days

$ 57.99 USD

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Should be replaced anytime leaks are detected

Rein Crankcase Ventilation Hose - Cylinders 1-4

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T#:17738390

Part#: 11617563476

Ships in 3 Business Days

$ 46.99 USD

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Manufactured with high-quality materials to withstand heat, dirt, and debris, matching OE expectations.

Vacuum Pipe

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T#:17704694

Part#: 11157603816

Ships in 3 Business Days

$ 35.99 USD

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$ 35.99 USD

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Rein Crank Case Ventilation Valve

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T#:17704764

Part#: 11158647298

In Stock at Vendor

$ 61.80 USD

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Designed to be a direct fit for OEM hoses, Rein has replacements for an affordable cost.

Crankcase Ventilation Connecting Pipe - Cylinders 1-4

T#:50626658

Part#: 11157646086

Ships in 1 Business Day

$ 57.99 USD

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

T#:19104

Part#: 11151747978

Ships in 1 Business Day

$ 5.69

This product was last offered at the strikethrough price on
06-05-2026

$ 5.68 USD

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O-RING 11151747978 Manufactured by Reinz

Crankcase Oil Separator and Vent Hose Kit - E90 325xi/330xi, E60 525x...

T#:221962

Part#: TMS221962

Ships in 1 Business Day

$ 458.99 USD

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$ 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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Oil Return Hose

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T#:592793

Part#: 11157560068

Ships in 1 Business Day

$ 9.99 USD

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Hose that attaches between the crankcase vent and the oil return pipe

BMW PCV Valve - Right Cylinder Bank

T#:45723145

Part#: 11157563506

Ships in 3 Business Days

$ 19.99 USD

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The Pressure Control Ventilation (PCV) valve is designed to route high-pressure blow-by gases from the crankcase into the intake manifold, relieving excess pressure while recycling gases back into the combustion process. When the PCV valve fails, it can lead to excessive oil consumption, rough idle, and stored engine fault codes. Replacing a worn or faulty valve restores proper crankcase ventilation, smooths out idle, clears codes, and helps keep your engine performing at its best.

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PCV Valve - Left Cylinder Bank

T#:45723146

Part#: 11157563505

Ships in 3 Business Days

$ 19.99

This product was last offered at the strikethrough price on
04-28-2026

$ 15.99 USD

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The Pressure Control Ventilation (PCV) valve is designed to route high-pressure blow-by gases from the crankcase into the intake manifold, relieving excess pressure while recycling gases back into the combustion process. When the PCV valve fails, it can lead to excessive oil consumption, rough idle, and stored engine fault codes. Replacing a worn or faulty valve restores proper crankcase ventilation, smooths out idle, clears codes, and helps keep your engine performing at its best.

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Oil Separator

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T#:555633

Part#: 11151705237

Ships in 1 Business Day

$ 10.99

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

$ 9.99 USD

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$ 9.99 USD

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Critical crankcase ventilation cyclone separator - great replacement or custom install!

Febi Crankcase Ventilation Hose - E34

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T#:381678

Part#: 11151708801

Ships in 1 Business Day

$ 11.99

This product was last offered at the strikethrough price on
05-07-2026

$ 9.99 USD

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Prone to cracking and breaking.

Febi Oil Separator - E53

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T#:363700

Part#: 11151705237

In Stock at Vendor

$ 21.99

This product was last offered at the strikethrough price on
05-07-2026

$ 20.99 USD

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Critical crankcase ventilation cyclone separator - great replacement or custom install!

Rein Pressure Regulator Valve Repair Kit - E53, E60, E63, E64, E65, E...

T#:55821694

Part#: 11127547058

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$ 16.99 USD

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$ 16.99 USD

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This Rein Automotive repair kit allows you to service the internal components of the crankcase breather valve independently. Instead of replacing the entire, costly valve cover or manifold assembly, this kit provides the exact wear items required to rebuild the factory housing back to original operating specifications. All components are manufactured to strict OE tolerances. The diaphragm is molded from premium, oil-resistant elastomers engineered to withstand prolonged exposure to aggressive synthetic lubricants, fuel vapors, and extreme under-hood heat cycles without losing its elasticity or sealing profile.

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