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Oil Separators & Vent lines
By OE Match
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
Fits:
Porsche 997.1 Carrera 2S / 4S 3.8L
Kit contains 3 oil separators, feed and return lines and breather lines.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
OILSEPARATOR.997S.1.OEM
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
Fits:
Porsche 996 C2 / C4 / C4S 3.6L 2002-05
Porsche 997.1 C2 / C2S / C4 / C4S 3.6L 2005-08
Click 'Zoom in' for large parts diagram.
Diagram ref no 5
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610714530
The product you are viewing cross references to these numbers
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
Fits:
Porsche 997.1 Carrera 4/ Carrera 4S 3.8L 2004-08
Click 'Zoom in' for large parts diagram.
Diagram ref no 7
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710714301
The product you are viewing cross references to these numbers
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
OE Match breather line for cylinders 4–6 on the listed Porsche 997.1 Carrera applications, this pipe connects the primary and secondary oil separators within the crankcase ventilation system.
Fits
- Porsche 997.1 Carrera 4/ Carrera 4S 3.8L 2004-08
- 997 MK1 Carrera 2S 3.8L 2005-08
- 997 MK1 Carrera 4S 3.8L 2005-08
Diagram ref no: 5
Check fitment for your specific vehicle (model, year, engine) before ordering.
What This Product Does
The line provides a passage between the oil separators, allowing crankcase gases to move through the ventilation circuit. It is a connecting pipe rather than an oil separator: oil separation takes place in the associated separator units.
Functions
- Connects the primary and secondary separator units.
- Carries ventilation gases through the cylinders 4–6 circuit.
- Provides a sealed connection within the breather system.
Technical Details
- Part reference: 99710714603.
- Brand: OE Match.
- Component: crankcase breather / vent line.
- Cylinder assignment: 4–6.
- Connection: primary separator to secondary separator.
Symptoms of Fault
Inspect the ventilation pipework if there is visible cracking, oil mist near a connection, an uneven idle or a whistling sound. Increased oil use and exhaust smoke can also accompany ventilation-system faults, but these symptoms do not establish that this particular line has failed.
Why Replacement Matters
A damaged or obstructed pipe can affect the ventilation circuit. Renewing a confirmed faulty line addresses that defect; it does not repair a failed separator or another source of oil consumption. During replacement, examine adjoining connections, seals and supporting components for deterioration.
FAQs
Does exhaust smoke prove the breather line needs replacing?
No. Separator faults, an incorrect oil level and other engine problems can produce similar signs. Establish the cause before selecting replacement parts.
What should be checked alongside this pipe?
Inspect neighbouring breather lines, separator connections and seals. Check the engine oil level as part of the diagnosis.
How should compatibility be confirmed?
Compare reference 99710714603 with the original component and verify the model, engine and production details. The supplied diagram identifies this line for the M97.01 3.8L application.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710714603
The product you are viewing cross references to these numbers
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
Engine oil separator breather hose. From air oil separator to engine.
Fits:
Porsche 997.1 Carrera S / Carrera 4S 2005-08
Diagram ref no 8
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710714502
The product you are viewing cross references to these numbers
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
OE Match oil separator for the engine breather lines on Porsche 997.1 Carrera 2S and Carrera 4S 3.8L models from 2005 to 2008. Fitted within the crankcase ventilation system, this component helps manage oil mist carried through the breather circuit and supports correct engine ventilation. The same part fits the left or right side, with 2 required per vehicle.
Sold individually
Fits:
Porsche 997 3.8L Carrera 2S / 4S 2005 - 2008
This oil separator forms part of the engine crankcase breather system. It works within the breather lines to help separate oil mist from crankcase vapours before they continue through the ventilation system.
- Forms part of the engine crankcase breather system
- Helps separate oil mist from breather vapours
- Supports correct crankcase ventilation
- Helps manage oil contamination within the breather system
- Fits either left or right side
- Replaces damaged, blocked or deteriorated oil separators
- Suitable for breather system servicing and engine maintenance
- Supplied as an OE Match replacement part.
Why Replace This Part?
- Increased oil residue within the intake or breather system
- Irregular crankcase ventilation
- Oil vapour contamination
- Breather system leaks
- Poor engine running associated with ventilation faults
- Deteriorated or damaged breather connections.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710713800
The product you are viewing cross references to these numbers
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
Oil Separator - Main Centre unit - is a direct-fit replacement for the factory crankcase ventilation system component used on Porsche 911 (997) Carrera 3.8L 2S / 4S engines. This separator plays a vital role in maintaining crankcase pressure equilibrium by separating oil mist from blow-by gases before routing clean air back into the intake manifold.
Porsche 997 3.8L Carrera 2S / 4S 2005 - 2008
• Position: Engine – main centre, crankcase ventilation housing
• Benefits: OE-style fit, improved oil vapor separation, durable diaphragm construction
• Installation: Direct-fit replacement; verify hose routing and seals during reassembly
• You see oil residue or smoke from the exhaust or intake
• The engine shows rough idle, whistling sounds, or high vacuum
• Oil consumption has increased significantly
• During engine service or PCV system maintenance
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710703801
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.
