CCV Oil Separator System for BMW Z Series E85/6 (2003-2008)

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BMWs oil separator and crankcase ventilation system is excellent at what it does when properly maintained. Always inspect any visible hoses when you are under the hood and follow the manufacturers replacement schedule.
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Comprehensive Constant Pressure Valve Replacement Kit
10X Entries Into Our F80 M3 Sweepstakes
Packaged by Turner - Corporate Logo
T#:557341
Part#: 11111318185TMSKT
In Stock
Sale - Save 2% $ 85.93

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

$ 84.32 USD
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Sale - Save 2%
$ 85.93

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

$ 84.32 USD
Free Shipping

When your CPV O-ring fails it causes a slow oil leak on the passenger side of the engine, making an oily mess that frequently resembles a rear main seal leak. Replacing the CPV with an upgraded o-ring ensures a long-term solution to this common problem. 

The factory o-ring over time fails from heat cycling and oil exposure due to the Buna rubber used in OEM o-rings, while the included Viton Fluoroelastomer is resistant to a much higher temperature to ensure prolonged life without leaking. 

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Genuine BMW - Corporate Logo
T#:12628
Part#: 11157834056
Ships in 9 Business Days
2% off MSRP $ 230.99

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

$ 225.99 USD
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2% off MSRP
$ 230.99

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

$ 225.99 USD
Free Shipping
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:
2005-2006 E46 BMW M3
2006-2008 E85 BMW Z4 M Roadster M Coupe
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Upgraded Silicone CCV Hose - (11157522931) - N52
10X Entries Into Our F80 M3 Sweepstakes
Turner Motorsport - Corporate Logo
T#:46203577
Part#: 058973LA02
In Stock
$ 101.99

This product was last offered at the strikethrough price on
06-24-2026

$ 78.99 USD
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$ 78.99 USD
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Due to weak plastic construction, the factory plastic crankcase ventilation breather hose is known to fail. After years of exposure to piping-hot engine bay temperatures and chemical-laden oil vapors, the corrugated plastic tubing can crack, crumble, or fail altogether.

We set out to bulletproof your N52 CCV system with a durable silicone breather hose, designed to provide a comprehensive upgrade and permanent replacement for the factory plastic hose. By replacing the flimsy, heat-hardened OEM plastic hose with a four-ply fluorosilicone hose, you'll experience peace of mind knowing your N52 is free from the inevitable return of oil leaks, vacuum leaks, and drivability concerns that would have been.

This breather hose is found at the front of the engine, and is used to connect the oil separator to the valve cover. It replaces OEM part number 11157522931.

Features:

Silicone construction ensures a durable replacement that is sure to outlast OE plastic
Designed as a direct replacement for the factory breather hose
Retains heating function and OE electrical connector
Design:

Four-ply wire-reinforced fluorosilicone hose is designed to resist degradation due to exposure to oil vapors
O-rings are pre-installed in OE connectors for a lasting seal
Includes pre-installed zinc-coated hose clamps for durability and corrosion resistance
Product Development:

Our Silicone CCV Hose Upgrade was designed, engineered, tested, and quality inspected by our Research and Development team in our Wadsworth, Ohio, facility. We strive for the highest level of precision and quality through leading-edge product development technology, including FARO laser scanning for reverse engineering and quality inspection, SolidWorks 3D CAD modelling, rapid prototyping utilizing our in-house 3D printer, and rigorous long-term product testing.

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Genuine BMW - Corporate Logo
T#:13027
Part#: 11617531423
Ships in 1 day
6% off MSRP $ 148.99

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

$ 139.99 USD
Free Shipping
6% off MSRP
$ 148.99

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

$ 139.99 USD
Free Shipping
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 solid 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 a oil sludge condition that is impossible to clear. Thankfully, the CCV is replaceable on the early N52 engines (2006) 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.

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 item fits the following BMWs:
2006-2011 E90 BMW 325i 325xi 330i 330xi - Sedan
2006-2012 E91 BMW 325xi - Wagon
2006-2007 E60 BMW 525i 525xi 530i 530xi
2006-2008 E85 BMW Z4 3.0i Z4 3.0si
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Genuine BMW - Corporate Logo
T#:22213
Part#: 11157567801
Ships in 1 day
4% off MSRP $ 184.99

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

$ 176.99 USD
Free Shipping
4% off MSRP
$ 184.99

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

$ 176.99 USD
Free Shipping


Genuine BMW Return Pipe -
This item fits the following BMW Chassis:
E85,E86,E90

Fits BMW Engines including:
N52

Genuine BMW Cold Climate Crankcase Pressure Regulator Valve
Superior performance for both warm and cold climates
Genuine BMW - Corporate Logo
T#:12455
Part#: 11617533400
Ships in 1 day
2% off MSRP $ 119.99

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

$ 117.99 USD
Free Shipping
2% off MSRP
$ 119.99

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

$ 117.99 USD
Free Shipping
GENUINE BMW PRESSURE REGULATING VALVE:117059

We sell this part as part of a larger kit that includes all the hoses required BMW Crankcase Vent, PCV, and Oil Separator Systems
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Oil Separator Valve
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:594299
Part#: 11617531423
Ships in 3 Business Days
$ 120.81 USD
Free Shipping
$ 120.81 USD
Free Shipping
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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Turner Motorsport - Corporate Logo
T#:2895
Part#: 11617533400-E85
Back Ordered
Sale - Save 5% $ 406.99

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

$ 386.64 USD
Free Shipping
Sale - Save 5%
$ 406.99

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

$ 386.64 USD
Free Shipping
This Crankcase Vent / Oil Separator Repair Kit includes the updated oil separator valve, oil dipstick guide tube and hoses. This kit fits E85 Z4 2.5i Z4 3.0i 2003-2005.

This item fits the following BMWs:
2003-2006 E85 BMW Z4 2.5i Z4 3.0i
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