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

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T#:641646

Part#: 11617501566S1

In Stock

Sale - Save 30% $ 97.99

This product was last offered at the strikethrough price on
11-07-2026

$ 68.59 USD

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Sale - Save 30%

$ 97.99

This product was last offered at the strikethrough price on
11-07-2026

$ 68.59 USD

Add to Wish List

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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URO PCV Breather Hose Kit - E39, E46, E83

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T#:592719

Part#: BMM54PCVKIT

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$ 117.99 USD

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$ 117.99 USD

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Comes with everything needed to refresh the PCV System!

Rein Crankcase Ventilation Hose Kit (CCV) - 11617504535K - E46, E39, ...

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T#:379190

Part#: 11617504535K

Ships in 1 Business Day

$ 79.99 USD

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$ 79.99 USD

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Turner Motorsport presents the Crankcase Ventilation System Refresh Kit for BMW owners experiencing malfunctioning or aged CCV systems. This comprehensive kit includes all necessary hoses to complete a refresh, ensuring optimal performance and reliability for your BMW's CCV system.

Addresses malfunctioning CCV systems
Ensures proper ventilation of the crankcase
Comprehensive kit includes all necessary hoses
Restores performance and reliability
Compatible with various BMW models

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"Cold Climate" Oil Separator Kit

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T#:377838

Part#: 11617534237

Ships in 1 Business Day

$ 74.99 USD

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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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"Cold Climate" Crankcase Pressure Regulator Valve

Superior performance for both warm and cold climates

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T#:376770

Part#: 11617533400

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$ 40.99 USD

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$ 40.99 USD

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Commonly referred to as the "oil separator" or PCV

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

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

URO PCV Breather Hose Kit - E39, E46, E83

Rein Crankcase Ventilation Hose Kit (CCV) - 11617504535K - E46, E39, ...

"Cold Climate" Oil Separator Kit

"Cold Climate" Crankcase Pressure Regulator Valve

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