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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Turner S54 CSL Silicone Crankcase Vent Hose - E46 M3 Z3M
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Turner Motorsport - Corporate Logo
T#:10681673
Part#: 018562LA02
In Stock
Sale - Save 40% $ 93.99

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

$ 56.39 USD
Free Shipping on orders $49 and up
Sale - Save 40%
$ 93.99

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

$ 56.39 USD
Free Shipping on orders $49 and up

The factory rubber/plastic hoses become brittle and crack over time. Brittle and cracked hoses can cause multiple vacuum leaks that are impossible to repair without hose replacement. Vacuum leaks can cause many problems including rough running, missing, stalling at idle, and even a no-start condition.

The factory hoses offered through BMW are plastic and will yield the same results of becoming brittle and damaged over time. Our solution is a premium replacement that will outlast everyone of the OEM replacements. Our Silicone Crankcase Vent Hose can be used to replace the factory brittle hose to ensure your S54 is free from vacuum leaks and performing properly.

CSL Vent Hose (11157833649) - Silicone Crankcase Vent hose is a direct replacement

Key benefits:

Lifetime replacement of the brittle OEM plastic crankcase breather hose that is susceptible to cracking overtime from constant heat cycling

Design:

Retains OEM hose end fittings to ensure proper seal

“Black” 3 ply reinforced silicone w/ “White” Turner logo

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Tuner S54 Silicone Crankcase Vent Hose Repair Kit - E46 M3 Z3M ...
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Turner Motorsport - Corporate Logo
T#:7196695
Part#: 018562LA01
In Stock
Sale - Save 40% $ 41.99

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

$ 25.19 USD
Free Shipping on orders $49 and up
Sale - Save 40%
$ 41.99

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

$ 25.19 USD
Free Shipping on orders $49 and up
The factory rubber/plastic hoses become brittle and crack over time. Brittle and cracked hoses can cause multiple vacuum leaks that are impossible to repair without hose replacement. Vacuum leaks can cause many problems including rough running, missing, stalling at idle, and even a no-start condition. Replace the brittle or broken line that attaches between the oil separator and air box. Our Turner Silicone Crankcase Hose can be used in place of both the standard and CSL intake boxes.

Our engineers at Turner sought out to solve the degrading issues that happens with the factory crankcase vent hose and found the best solution is a silicone replacement. Our Turner Silicone Crankcase Vent Hose can be used to replace the factory brittle hose to prevent vacuum leaks and lackluster performance. Simply take your factory crankcase vent hose and remove the ends; the factory ends can be installed on the new Silicone Vent Hose with the supplied clamps for a tight seal.

Turner Silicone Crankcase Vent Hose replaces the following part #'s:

CSL Vent Hose (11157833649) - Silicone Crankcase Vent hose is a direct replacement
Non-CSL Vent Hose(11157831311) - Silicone hose will make a "U" bend with direct fitment and can also be trimmed for your own preferable fit.

- Key benefits:

Lifetime replacement of the brittle OEM plastic crankcase breather hose that is susceptible to cracking overtime from constant heat cycling
- Design:

Turner logo forward facing when hood is open
Retains OEM hose end fittings to ensure proper seal and reduce cost
“Black” 3 ply reinforced silicone w/ “White” Turner logo
includes 2 German style 430 stainless worm-drive clamps for installation
- Special care instructions:

Do not overtighten hose clamps, hand tight is recommended.
Carefully cut the OEM plastic casing from both plastic fittings for reuse

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AN CSL Crankcase Vent Hose - (00-04.5)
For Vehicles Fitted with a CSL Intake Plenum
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Turner Motorsport - Corporate Logo
T#:16907195
Part#: 043464LA02
In Stock
Sale - Save 25% $ 178.99

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

$ 134.24 USD
Free Shipping on orders $49 and up
Sale - Save 25%
$ 178.99

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

$ 134.24 USD
Free Shipping on orders $49 and up

A combination of billet fittings and AN lines for an upgraded and serviceable crankcase vent hose. Attaches between the oil separator and the CSL air box.

The factory rubber/plastic hoses become brittle and crack over time. Brittle and cracked hoses can cause multiple vacuum leaks that are impossible to repair without hose replacement. Vacuum leaks can cause many problems including rough running, missing, stalling at idle, and even a no-start condition. The factory hoses offered through BMW are plastic and will yield the same results of becoming brittle and damaged over time.

We have created a full motorsport style solution with our CSL Crankcase made from machined 6061 billet aluminum with AN style fittings and nylon fiber braided lines. This is a fully serviceable replacement that will outlast every one of the OEM replacements. Our AN crankcase line can be used to replace the factory brittle hose to ensure your S54 is free from vacuum leaks and performing properly.

OEM CSL Vent Hose (11157833649) - Direct Replacement

Key benefits:

Lifetime replacement of the brittle OEM plastic crankcase breather hose
Fully Serviceable
Motorsport Aesthetic to compliment your CSL Intake Plenum
Design:

Fittings are made from billet 6061-T6 aluminum and finished in Type II black anodizing
Pre-anodized machined Turner branding
Nylon fiber braided lines
Fittings are a direct replacement for the plastic OEM fittings

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CSL Crankcase Vent Hose - AN Lines and Fittings (04.5-06)
10X Entries Into Our F80 M3 Sweepstakes 10X Entries For Our Spin To Win Sweepstakes!
Turner Motorsport - Corporate Logo
T#:17405917
Part#: 043464LA03
Ships in 9 Business Days
Sale - Save 25% $ 177.99

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

$ 133.49 USD
Free Shipping on orders $49 and up
Sale - Save 25%
$ 177.99

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

$ 133.49 USD
Free Shipping on orders $49 and up

A combination of billet fittings and AN lines for an upgraded and serviceable crankcase vent hose. Attaches between the oil separator and the CSL air box.

The factory rubber/plastic hoses become brittle and crack over time. Brittle and cracked hoses can cause multiple vacuum leaks that are impossible to repair without hose replacement. Vacuum leaks can cause many problems including rough running, missing, stalling at idle, and even a no-start condition. The factory hoses offered by BMW are plastic and will yield the same results of becoming brittle and damaged over time.

We have created a full motorsport-style solution with our CSL Crankcase made from machined 6061 billet aluminum with AN-style fittings and nylon fiber braided lines. This is a fully serviceable replacement that will outlast every one of the OEM replacements. Our AN crankcase line can be used to replace the factory brittle hose to ensure your S54 is free from vacuum leaks and performing properly.

OEM CSL Vent Hose (11157833649) - Direct Replacement for cars with secondary shut-off valve. (11157834056)

Key benefits:

Lifetime replacement of the brittle OEM plastic crankcase breather hose
Fully Serviceable
Motorsport Aesthetic to compliment your CSL Intake Plenum
Design:

Fittings are made from billet 6061-T6 aluminum and finished in Type II black anodizing
Pre-anodized machined Turner branding
Nylon fiber braided lines
Fittings are a direct replacement for the plastic OEM fittings
Not for sale or use in the state of California on any pollution-controlled vehicle as per the California Air Resources Board.

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Genuine BMW - Corporate Logo
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
Free Shipping
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
Free Shipping

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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Genuine BMW - Corporate Logo
T#:13024
Part#: 11617503666
Ships in 1-2 days
$ 23.99 USD
Free Shipping on orders $49 and up


Genuine BMW Hose Elbow -
This item fits the following BMW Chassis:
E39,E46,E53 X5,E83 X3,E85

Fits BMW Engines including:
M54


Genuine BMW - Corporate Logo
T#:13028
Part#: 11617533399
In Stock
2% off MSRP $ 42.99

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

$ 41.99 USD
Free Shipping on orders $49 and up
2% off MSRP
$ 42.99

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

$ 41.99 USD
Free Shipping on orders $49 and up
GENUINE BMW CONNECTING LINE:111060
Genuine BMW - Corporate Logo
T#:348236
Part#: 11617504536
In Stock
2% off MSRP $ 43.99

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

$ 42.99 USD
Free Shipping on orders $49 and up
2% off MSRP
$ 43.99

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

$ 42.99 USD
Free Shipping on orders $49 and up

Part of the vacuum and emissions system that runs from the intake manifold back to the connecting hose.
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.

Fits the following BMW's:
E46 M52 (from 01/2000) and M54
E39 M52 (from 01/2000) and M54
E53 M54
E60 M54
E83 M54
Z3 M52 (up to 01/2000 for 2.3L and from 01/2000 for 2.8L) and M54
Z4 M54

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Genuine BMW - Corporate Logo
T#:12911
Part#: 11157831311
Ships in 1-2 days
2% 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.

$ 100.99 USD
Free Shipping on orders $49 and up
2% 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.

$ 100.99 USD
Free Shipping on orders $49 and up
This hose directs the oil & combustion vapors from the valve cover and directs them to the intake manifold where they are put through combustion again in order to reduce emissions. We recommend replacing this hose when replacing the oil separator #11157840446.

This item fits the following BMWs:
2001-2004 E46 BMW M3
2001-2002 Z3 BMW M Roadster M Coupe
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Genuine BMW - Corporate Logo
T#:367705
Part#: 11611432559
Ships in 1-2 days
$ 47.99 USD
Free Shipping on orders $49 and up
$ 47.99 USD
Free Shipping on orders $49 and up
Genuine BMW - Corporate Logo
T#:348228
Part#: 11157532629
Ships in 1-2 days
$ 39.99 USD
Free Shipping on orders $49 and up
$ 39.99 USD
Free Shipping on orders $49 and up
Genuine BMW - Corporate Logo
T#:367590
Part#: 11157532649
Ships in 1-2 days
$ 39.99 USD
Free Shipping on orders $49 and up
$ 39.99 USD
Free Shipping on orders $49 and up


Genuine BMW - Corporate Logo
T#:19233
Part#: 11617533398
Ships in 1-2 days
$ 47.99 USD
Free Shipping on orders $49 and up
$ 47.99 USD
Free Shipping on orders $49 and up
Genuine BMW ENGINE VENT PIPE
Genuine BMW Upper Oil Separator Vent Tube
For vehicles with production date from 01/2000
Genuine BMW - Corporate Logo
T#:7025
Part#: 11617504535
Ships in 1-2 days
2% off MSRP $ 42.99

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

$ 41.99 USD
Free Shipping on orders $49 and up
2% off MSRP
$ 42.99

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

$ 41.99 USD
Free Shipping on orders $49 and up


Genuine BMW Connecting Line -
This item fits the following BMW Chassis:
E39,E46,E53 X5,E83 X3,E85

Fits BMW Engines including:
M52,M54

Genuine BMW - Corporate Logo
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
Free Shipping
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
Free Shipping
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
Genuine BMW - Corporate Logo
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
Free Shipping
$ 395.99 USD
Free Shipping

Genuine BMW Emissions Service Kit - E46 M3
For vehicles with manual transmission only and production date up to 09/2004
Genuine BMW - Corporate Logo
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
Free Shipping
$ 390.99 USD
Free Shipping
Genuine BMW - Corporate Logo
T#:42005
Part#: 13531437282
Ships in 8 Business Days
3% off MSRP $ 39.99

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

$ 38.99 USD
Free Shipping on orders $49 and up
3% off MSRP
$ 39.99

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

$ 38.99 USD
Free Shipping on orders $49 and up


Genuine BMW Vacuum Pipe -
This item fits the following BMW Chassis:
E46

Fits BMW Engines including:
M52


Genuine BMW - Corporate Logo
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
Free Shipping
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
Free Shipping


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

Fits BMW Engines including:
S54

Genuine BMW - Corporate Logo
T#:32270
Part#: 11157513756
Ships in 1-2 days
$ 148.91 USD
Free Shipping on orders $49 and up


Genuine BMW Vent Hose -
This item fits the following BMW Chassis:
E46

Fits BMW Engines including:
M56


Cold Climate Oil Separator Kit - Level 2
Superior performance for both warm and cold climates
Genuine BMW - Corporate Logo
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
Free Shipping
$ 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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Genuine BMW - Corporate Logo
T#:149270
Part#: 64111368684
Ships in 1-2 days
$ 14.99 USD
Free Shipping on orders $49 and up


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#: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
Free Shipping
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
Free Shipping


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
Genuine BMW - Corporate Logo
T#:577309
Part#: 11157840446KT5
Ships in 1-2 days
$ 613.99 USD
Free Shipping
$ 613.99 USD
Free Shipping