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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 (3)

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Genuine BMW Vent Hose - 11617831930 - E46,E85,E46 M3,E85 Z4M ...

T#:14624

Part#: 11617831930

Ships in 1-2 days

2% off MSRP $ 127.99

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

$ 124.99 USD

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2% off MSRP

$ 127.99

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

$ 124.99 USD

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Vents gases from the crankcase back into the intake.
When doing any sort of repair or maintenance there is no replacement for genuine factory parts. Turner Motorsport carries the Genuine BMW brand with pride and has the parts you need to complete your next project with confidence.

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

Fits BMW Engines including:
S54

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

2X Entries Into Our F80 M3 Sweepstakes

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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Genuine BMW Crankcase Pressure Regulator Valve

T#:367709

Part#: 11617501566

Ships in 1-2 days

6% off MSRP $ 102.99

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

$ 96.99 USD

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6% off MSRP

$ 102.99

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

$ 96.99 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 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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Genuine BMW Emissions Service Kit - E46 M3

For vehicles with manual transmission only and production date up to 09/2004

T#:375196

Part#: 11157840446KT3

Ships in 1-2 days

$ 397.99

This product was last offered at the strikethrough price on
07-06-2026

$ 395.99 USD

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$ 395.99 USD

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Genuine BMW Emissions Service Kit - E46 M3

For vehicles with manual transmission only and production date up to 09/2004

T#:375194

Part#: 11157840446KT1

Ships in 1-2 days

$ 392.99

This product was last offered at the strikethrough price on
07-06-2026

$ 390.99 USD

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$ 390.99 USD

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Genuine BMW PCV Pipe - E46 M3

T#:36621

Part#: 11617832298

Ships in 1-2 days

3% off MSRP $ 72.99

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

$ 70.99 USD

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3% off MSRP

$ 72.99

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

$ 70.99 USD

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Genuine BMW Pipe
This item fits the following BMW Chassis:
E46 M3,E46

Fits BMW Engines including:
S54

Cold Climate Oil Separator Kit - Level 2

Superior performance for both warm and cold climates

T#:375276

Part#: 11617533400KT2

Ships in 1-2 days

$ 416.99

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

$ 374.99 USD

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$ 374.99 USD

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If you're ready for a complete, hassle free oil separator service, our kit builds on our core setup by adding crucial high wear rubber and sealing components to ensure maximum performance and zero vacuum leaks.

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Return Pipe - E46, Z3, Z4

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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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

Genuine BMW Emissions Service Kit - E46 M3

For vehicles with SMG gearbox and production date up to 09/2004

T#:577309

Part#: 11157840446KT5

Ships in 1-2 days

$ 613.99 USD

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$ 613.99 USD

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Replacement (9)

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Oil Separation & Breather System
- CCV/PCV Breather Hoses (3)

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