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Oil Separators & Vent lines
By OE Match
- Porsche 957 Cayenne S / GTS 4.8L 2007-10
Engine Crankcase Breather Hose Kit (Silver lids)
The engine crankcase breather hose is a key part of your vehicle’s positive crankcase ventilation (PCV) system. Its main role is to route pressurized gases from the engine crankcase to the PCV valve (also called the air/oil separator). The PCV valve captures harmful oil vapers , drains them back into the engine, and redirects the cleaned air to the intake system to be burned during normal combustion.
Without a properly functioning breather hose, your engine can develop performance issues, oil leaks, and even emissions failures.
Fits:
Porsche 957 Cayenne S / GTS 4.8L 2009 - 2010
Why the Engine Crankcase Breather Hose Matters
During combustion, engines naturally produce positive crankcase pressure. This pressure combines with heat and oil vapers inside the crankcase. The breather hose is designed to handle this flow and keep your PCV system working efficiently.
Over time, however, exposure to heat, oil, and pressure makes the breather hose a common failure point. When damaged, it can cause poor performance, check engine lights, and increased emissions.
Common Symptoms of a Failing Crankcase Breather Hose
- Cracks, leaks, or breaks – Heat and oil vapers degrade rubber or plastic over time, leading to air leaks.
- Broken connectors or clips – Brittle plastic can snap during service or due to age.
- Visible damage – Hoses may split, soften, or harden, creating noticeable holes.
- Check Engine Light (CEL) – Unmetered air from a leak often triggers intake-related fault codes.
- Engine misfires or rough idle – Severe air leaks upset the air/fuel mixture, causing misfires.
Oil residue or odour – Escaping vapers leave oily deposits on the hose, engine block, and nearby components. In severe cases, you may smell burning oil.
Why You Shouldn’t Ignore a Bad Breather Hose
A faulty crankcase breather hose affects engine performance, fuel efficiency, and emissions compliance. Left untreated, it can cause long-term engine damage and costly repairs.
If you notice any of the above signs, it’s important to inspect and replace your crankcase breather hose as part of regular PCV system maintenance.
Diagram ref no 13 (Cyl 1-4) or 14 (Cyl 5-8)
NOTE: This part is compatible only with 957 Cayenne S/GTS models produced from the 2009 model year onwards. It is not compatible with earlier models equipped with the silver AOS.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94810723501
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche 957 Cayenne S / GTS 4.8L 2007-10
OE Match engine crankcase breather hose kit for Porsche 957 Cayenne S and GTS 4.8L models from 2009 to 2010. This replacement hose kit forms part of the positive crankcase ventilation (PCV) system, helping route crankcase gases correctly to the air/oil separator and intake system.
Fits:
Porsche 957 Cayenne S / GTS 4.8L 2009 - 2010
Diagram ref no 13, 14, 1, 10 & 19
Why the Engine Crankcase Breather Hose Matters
During combustion, engines naturally produce positive crankcase pressure. This pressure combines with heat and oil vapers inside the crankcase. The breather hose is designed to handle this flow and keep your PCV system working efficiently.
Over time, however, exposure to heat, oil, and pressure makes the breather hose a common failure point. When damaged, it can cause poor performance, check engine lights, and increased emissions.
Common Symptoms of a Failing Crankcase Breather Hose
- Cracks, leaks, or breaks – Heat and oil vapers degrade rubber or plastic over time, leading to air leaks.
- Broken connectors or clips – Brittle plastic can snap during service or due to age.
- Visible damage – Hoses may split, soften, or harden, creating noticeable holes.
- Check Engine Light (CEL) – Unmetered air from a leak often triggers intake-related fault codes.
- Engine misfires or rough idle – Severe air leaks upset the air/fuel mixture, causing misfires.
Oil residue or odour – Escaping vapers leave oily deposits
on the hose, engine block, and nearby components. In severe cases, you may
smell burning oil.
Why You Shouldn’t Ignore a Bad Breather Hose
A faulty crankcase breather hose affects engine performance, fuel efficiency, and emissions compliance. Left untreated, it can cause long-term engine damage and costly repairs.
If you notice any of the above signs, it’s important to inspect and replace your crankcase breather hose as part of regular PCV system maintenance.
NOTE: This part is compatible only with 957 Cayenne S/GTS models produced from the 2009 model year onwards. It is not compatible with earlier models equipped with the silver AOS.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94810723603
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche 957 Cayenne S / GTS 4.8L 2007-10
Fits:
Porsche 957 Cayenne S / GTS 4.8L 2009 - 2010
Diagram ref no 13 (Cyl 1-4) or 14 (Cyl 5-8)
NOTE: This part is compatible only with 957 Cayenne S/GTS models produced from the 2009 model year onwards. It is not compatible with earlier models equipped with the silver AOS.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94810723
The product you are viewing cross references to these numbers
- Porsche 957 Cayenne Turbo / Turbo S 4.8L 2007-10
Fits:
Porsche 957 Cayenne Turbo / Turbo S 2007-2008
Porsche 957 Cayenne Turbo S / Turbo (with Enhanced performance engine) 2009-2010
Click 'Zoom in' for large parts diagram.
Diagram ref no 13
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94810723552
The product you are viewing cross references to these numbers
- Porsche 957 Cayenne Turbo / Turbo S 4.8L 2007-10
Fits:
Porsche 957 Cayenne turbo / turbo S -2007 to 2008
Porsche 957 Cayenne turbo S / turbo 2009 to 2010 (with Enhanced performance engine)
Diagram ref no 14
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94810723652
The product you are viewing cross references to these numbers
- Porsche 957 Cayenne Turbo / Turbo S 4.8L 2007-10
The Air / Oil Separator to Crankcase Vent Line is a OE MATCH engine ventilation component designed to connect the air/oil separator (AOS) to the crankcase ventilation system. This line allows separated crankcase gases to be routed correctly back into the intake system while helping prevent oil vapour from entering critical engine components.
Fits:
- Porsche 957 Cayenne Turbo / Turbo S 4.8L 2007-10
Diagram Ref No 1
What This Product Does:
- Routing crankcase gases from the air/oil separator
- Supporting efficient oil vapour separation
- Maintaining proper crankcase pressure regulation
- Reducing oil contamination in the intake system
- Helping prevent sludge build-up inside the engine
Symptoms Of Wear Or Failure:
- Rough idle or unstable engine performance
- Check Engine Light illumination
- Increased oil consumption
- Oil leaks from seals or gaskets
- Whistling or hissing noises (vacuum leak)
- Excessive smoke from the exhaust
- Oil residue around breather or intake components
Why Replacement Matters:
- Restore correct PCV system operation
- Prevent oil leaks and pressure-related damage
- Improve engine performance and efficiency
- Protect intake components from oil contamination
- Avoid costly engine repairs
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94810722951
The product you are viewing cross references to these numbers
- Porsche 957 Cayenne S / GTS 4.8L 2007-10
Fits:
Porsche 957 Cayenne S / GTS >>2008
Diagram ref no 13 (Cyl. 1-4) or 14 (Cyl 5-8).
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94810723
The product you are viewing cross references to these numbers
- Porsche 957 Cayenne Turbo / Turbo S 4.8L 2007-10
- Porsche 958 Cayenne Turbo V8 4.8L Petrol (500Hp) 2010-17
- Porsche 958 Cayenne Turbo S V8 4.8L Petrol (550Hp) 2010-17
The Crankcase Vent / Breather Hose is a OE MATCH engine ventilation component designed to regulate crankcase pressure and support proper Positive Crankcase Ventilation (PCV) system operation. This hose routes blow-by gases from the crankcase back into the intake system, where they are safely reburned during combustion.
Fits:
- Porsche 957 Cayenne Turbo / Turbo S 4.8L 2007-10
- Porsche 958 Cayenne Turbo V8 4.8L Petrol (500Hp) 2010-17
- Porsche 958 Cayenne Turbo S V8 4.8L Petrol (550Hp) 2010-17
Diagram Ref No 6
What This Product Does:
- Relieving excess crankcase pressure
- Routing blow-by gases into the intake system
- Supporting proper PCV system function
- Reducing oil vapour contamination
- Helping prevent sludge build-up inside the engine
Symptoms Of Wear Or Failure:
- Rough or unstable idle
- Check Engine Light illumination
- Oil leaks from engine seals or gaskets
- Increased oil consumption
- Whistling or hissing sounds (vacuum leak)
- Excessive exhaust smoke
- Oil residue around breather or intake connections
Why Replacement Matters:
- Restore proper crankcase pressure regulation
- Prevent oil leaks and vacuum-related issues
- Improve engine efficiency and performance
- Maintain emissions system integrity
- Avoid costly engine repairs
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95510725150
The product you are viewing cross references to these numbers
- Porsche 957 Cayenne S / GTS 4.8L 2007-10
OE Match crankcase ventilation (breather) vent line that connects between the air/oil separators on the Porsche Cayenne 957 (9PA1) engine ventilation system. It supersedes older numbers 94810724501 and 94810724500.
Fits:
Porsche 957 Cayenne S / GTS 4.8L 2007 - 2010
* Engine type 4801
Diagram ref no 19
This vent line is part of the Cayenne’s PCV / crankcase ventilation circuit, routing crankcase vapours between the separator units to keep pressure regulation stable and help return oil mist to the correct areas. It transfers crankcase vapours through the separator network so the system can manage blow-by gases effectively, reducing unwanted pressure build-up and helping limit oil vapour escape into the engine bay.
Function:
• Links the air/oil separator assemblies as part of the engine breather system
• Helps maintain correct crankcase pressure control
• Supports cleaner operation by managing oil vapour separation and routing
Breather/vent hoses live in a hot, oily environment and can harden, split, or lose sealing at the ends. A compromised vent line can contribute to vacuum/pressure leaks, oil misting, rough running, or PCV-related faults. Replacing it restores proper sealing and correct vapour routing.
When to Replace:
• Visible cracks, softness, or oil saturation on the hose
• Oil misting/residue around breather connections
• PCV-related drivability issues or fault codes
• During air/oil separator or major intake/engine-bay service
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94810724502
The product you are viewing cross references to these numbers
- Porsche 957 Cayenne Turbo / Turbo S 4.8L 2007-10
OE Match connecting vent line for the air/oil separators. This breather component forms part of the engine’s crankcase ventilation system.
Fits:
- Porsche 957 Cayenne Turbo / Turbo S 4.8L 2007-10
Diagram Ref No 19
Check fitment for your specific vehicle (model, year, engine) before ordering.
What This Product Does
The line provides the connection linking the air/oil separators, allowing ventilation gases to pass through this part of the breather assembly. It is a connecting pipe, rather than an oil separator or non-return valve.
Functions
- Connects the air/oil separator assemblies.
- Provides a passage for crankcase ventilation gases.
- Supports the intended routing of the engine breather system.
Technical Details
- Brand: OE Match.
- Internal diagram description: breather line.
- Diagram engine/model identifier: 4851.
Symptoms of Fault
Inspection is appropriate if the line becomes brittle, develops cracks or shows oily deposits around its connections. Rough idling, unusual breather noises or increased oil use can also accompany ventilation faults, but do not establish that this line is the cause.
Why Replacement Matters
Renewing a damaged connecting line helps restore a sealed ventilation path. Check the neighbouring breather pipes, connections and separator assemblies during diagnosis rather than assuming every ventilation symptom requires this component.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94810724553
The product you are viewing cross references to these numbers
- Porsche 957 Cayenne S / GTS 4.8L 2007-10
Vent Line – Oil Separator to Crankcase
Fits:- Porsche 957 Cayenne S / GTS 4.8L 2007-10
Diagram ref no 1
This vent line forms part of the engine's crankcase
ventilation system, connecting the oil separator with the crankcase ventilation
circuit. It helps route blow-by gases and oil vapour correctly through the
breather system while supporting controlled crankcase pressure.
What Does the Vent Line Do?
During normal engine operation, combustion gases can pass
the piston rings and enter the crankcase. The crankcase ventilation system
manages these gases and routes oil-laden vapours through the air/oil separator
system.
This vent line provides part of that connection, allowing
vapours to move through the system while helping maintain the correct crankcase
pressure.
Why Does It Fail?
Breather and vent lines operate in a hot engine environment and are continually exposed to oil vapour.
Over time they can:
- Harden or become brittle
- Crack or split
- Develop leaks at their connections
- Become contaminated with oil residue
- Suffer damage during engine maintenance
Age-related deterioration is particularly relevant on older Cayenne models.
When Should It Be Replaced?
Inspect the vent line if there are signs of:
Visible cracking or splitting Oil residue around connections Vacuum or pressure leaks Hissing noises Rough or unstable idle PCV-related engine faults Deteriorated connector endsA damaged vent line can interfere with the operation of the crankcase ventilation system, so the associated air/oil separators and other breather hoses should also be inspected.
Checks Before Installation
When replacing the vent line, inspect:
- Air/oil separators
- Adjacent breather hoses
- Hose connections and seals
- Crankcase ventilation valves
- Intake connections
- Evidence of oil leakage
- Brittle or damaged plastic fittings
Replacing other deteriorated breather components at the same time can help avoid repeated dismantling.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94810724702
The product you are viewing cross references to these numbers
OEMatch Oil Separators & Vent lines — Durability, Sealing, Performance
The oil separator and vent line system manages crankcase ventilation on Porsche engines by separating oil vapour from blow-by gases and returning cleaner air to the intake. Properly functioning separators and breather hoses reduce oil contamination and help preserve throttle response, idle quality and long-term engine cleanliness. OEMatch supplies replacements and related hoses prepared for Porsche applications to support routine maintenance and rebuilds.
Available Types- Oil separators (breather housings)
- Breather hoses and vent lines
- Seals, grommets and connection fittings
OE (Original Equipment) refers to parts matching original specifications for the oil separators & vent lines and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM oil separators & vent lines engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models.
The oil separator and vent system controls crankcase pressure, removes oil vapour from circulating gases and keeps intake air free of oil droplets.
When functioning correctly the system prevents oil entering the intake tract, reduces smoke and limits carbon build-up on inlet valves and ports. OEMatch also maintains a catalogue of more than 4,000 individual part numbers and over 8,700 OE cross-references to aid correct selection for Porsche applications.
- Restores clean airflow and stable crankcase pressure
- Reduces oil leaks, blue smoke and carbon accumulation
- Supports consistent idle and throttle response
- Clogged or degraded internal membranes inside separators
- Cracked, hardened or collapsed breather hoses due to heat and age
- Worn seals, grommets or connection points causing leaks
- Vacuum leaks affecting idle and throttle response
- Sludge or condensation build-up inside vent lines
Replacing a worn or damaged separator or vent line restores correct crankcase breathing and helps avoid progressive engine issues such as oil contamination, valve deposits and inconsistent running. Fitted components specified for Porsche engines help preserve emissions performance and reduce the risk of oil reaching the intake tract. Select parts that match the original connections and materials for reliable long-term operation.
Advantages- Direct-fit replacements engineered to match original dimensions and tolerances
- Components manufactured in heat- and oil-resistant materials for longevity
- Catalogue cross-references and part numbers to support correct selection for Porsche models
Installation should be carried out by a qualified technician following model-specific procedures and torque settings. Use calibrated tools and new fasteners where specified. If you are unsure about hidden sensors or routing, seek professional installation to ensure correct sealing and operation.
