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Oil Separators & Vent lines
By OE Match
- Porsche 955 Cayenne Turbo 4.5L 2003-06
Vent line from valve cover to crankcase
Vent line from the valve cover to the crankcase by OE Match for the Porsche 955 Cayenne Turbo 4.5L from 2003–06. This replacement line forms part of the M48.50 engine crankcase ventilation system.
Fits:
Porsche 955 Cayenne Turbo 4.5L 2003 - 2006
Diagram ref no 12
What This Product Does
The vent line provides a route between the valve cover and crankcase, allowing crankcase gases to move through the engine ventilation system. Correct ventilation helps manage crankcase pressure and limits the escape of oil mist around damaged or poorly sealed connections.
Functions
- Routes crankcase gases through the ventilation system
- Connects the valve cover and crankcase ventilation circuit
- Helps maintain controlled crankcase pressure
- Supports the management of oil vapour within the breather system
Technical Details
- Brand: OE Match
- Part type: valve cover-to-crankcase vent line
- OE reference: 94810721552
- Engine application: M48.50 4.5L V8
- Assembly: valve cover and engine cover
- Diagram ref no 12
Symptoms of Fault
- Cracks or brittleness in the existing vent line
- Oil mist or seepage around the hose connections
- Whistling or unusual noises from the crankcase area
- Rough or unstable idle caused by an air leak
- Increased oil consumption or smoke
- Abnormal crankcase vacuum
Why Replacement Matters
Age, engine heat and repeated pressure cycles can cause a breather line to harden, split or lose its seal. Replacing a damaged line helps restore the intended ventilation route and reduces the risk of vacuum leaks, oil residue and unstable crankcase pressure. Inspect adjoining seals, fittings and breather components during installation, as deterioration elsewhere in the system can produce similar symptoms.
OE Reference
- 94810721552
FAQs
- Does smoke always indicate a failed vent line? No. Smoke can also be associated with the oil separator, an incorrect oil level or internal engine faults, so diagnosis is recommended.
- Should connected components be inspected? Yes. Check the breather connections, seals and nearby hoses for cracks, oil contamination or poor sealing.
- Is this a Genuine Porsche component? This listing is for an OE Match replacement. The supplied OE reference should be used to confirm the required application.
- Which engine is this line associated with? The supplied diagram identifies it for the M48.50 engine used in the listed 955 Cayenne Turbo application.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94810721552
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.
