Oil Separation & Breather System for BMW 3 Series E46 (1999-2005)

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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 (4)

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Bremmen "Cold Climate" Crankcase Pressure Regulator Valve Kit - BMW M...

T#:2528129

Part#: 11617533400S1

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Sale - Save 14% $ 110.99

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

$ 94.99 USD

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Sale - Save 14%

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This product was last offered at the strikethrough price on
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$ 94.99 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. 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. Don't forget to order a valve cover gasket, throttle body gasket, and a new intake boot to make your separator change easier and more comprehensive.

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Crankcase Vent Hose

T#:30629661

Part#: 11157831311

In Stock

Sale - Save 21% $ 30.99

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

$ 24.47 USD

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Sale - Save 21%

$ 30.99

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

$ 24.47 USD

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Bremmen Oil Separator Kit - Level 1 - E39 E46 E83 Z3 Z4

T#:641646

Part#: 11617501566S1

In Stock

Sale - Save 15% $ 95.99

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

$ 81.59 USD

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Sale - Save 15%

$ 95.99

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

$ 81.59 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. Replace all the components of the oil separator system together to prevent damage to all the aspects of your engine. 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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Engine Crankcase Breather Element

Superior performance for both warm and cold climates

5X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:35795496

Part#: 11617533400

In Stock

$ 40.99 USD

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$ 40.99 USD

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Commonly referred to as the "oil separator" or PCV URO Parts is one of the leading manufacturers of high quality direct replacement aftermarket components, covering a wide range of makes and models. All of their replacement parts are manufactured to ISO 9000 certification standards, so you can expect long lasting performance from URO Parts.

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Crankcase Ventilation Hose

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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$ 15.99

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$ 12.23 USD

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Bremmen Crankcase Ventilation Hose - E39 E53 E60 E83 E46

T#:640147

Part#: 11611432559

In Stock

Sale - Save 22% $ 23.99

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

$ 18.76 USD

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Sale - Save 22%

$ 23.99

This product was last offered at the strikethrough price on
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$ 18.76 USD

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Crankcase Vent Hose - From Valve Cover to Oil Separator - Fit BMWs with the M52 or M54 6 cylinder engine

"Cold Climate" Crankcase Pressure Regulator Valve

We Price Match - Give Us A Call or Chat!

T#:35829339

Part#: 11617533400

Special Order: No Guaranteed ETA

$ 69.99 USD

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$ 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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Oil Separation & Breather System for BMW 3 Series E46 (1999-2005)

Sub-Categories

Bremmen "Cold Climate" Crankcase Pressure Regulator Valve Kit - BMW M...

Crankcase Vent Hose

Bremmen Oil Separator Kit - Level 1 - E39 E46 E83 Z3 Z4

Engine Crankcase Breather Element

Crankcase Ventilation Hose

Bremmen Crankcase Ventilation Hose - E39 E53 E60 E83 E46

"Cold Climate" Crankcase Pressure Regulator Valve

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