Breather Line. Porsche 957 Cayenne S / GTS / Turbo / Turbo S 4.8L 2007–10  ›  94810524551

Breather Line. 

The Genuine Porsche Engine Breather Line is a replacement crankcase ventilation component for the Porsche Cayenne 957 Turbo.

Fits:

• Porsche 957 Cayenne S / GTS 4.8L 2007-10
• Porsche 957 Cayenne Turbo / Turbo S 4.8L 2007-10  

Diagram Ref No 10

During normal engine operation, a small amount of combustion gas passes the piston rings and enters the crankcase. The breather system manages these blow-by gases and oil vapours, routing them through the engine ventilation system rather than allowing excessive pressure to build inside the crankcase.

The breather line provides a sealed passage for these vapours and is therefore important for maintaining correct crankcase pressure, controlling oil vapour and supporting efficient engine operation.

With age and repeated exposure to engine heat, oil vapour and pressure changes, breather lines can become brittle, cracked, loose or internally restricted. Replacing a deteriorated line helps restore the integrity of the crankcase ventilation system.

What This Product Does:

• Routes crankcase gases and oil vapours through the engine ventilation system.
• Helps prevent excessive pressure building inside the crankcase.
• Maintains a sealed pathway within the breather system.
• Supports correct operation of the crankcase ventilation system.
• Helps protect engine seals and gaskets from excessive crankcase pressure.
• Returns engine vapours to the appropriate ventilation or intake circuit.
• Supports effective emissions control by containing crankcase vapours.
• Helps maintain consistent engine operation.
• Replaces a cracked, brittle, leaking or damaged original breather line.

The breather system is designed to manage gases generated inside the crankcase and prevent uncontrolled pressure build-up during engine operation.

Symptoms Of Wear Or Failure:
Possible symptoms include:

• Rough or unstable idle.
• Hissing or whistling noises from the engine bay.
• Engine vacuum or air leaks.
• Increased oil consumption.
• Oil leaks developing around engine seals or gaskets.
• Oil mist or residue around breather connections.
• Visible cracking or splitting of the breather line.
• Hardened or brittle hose material.
• Loose or damaged connections.
• Engine management warning light.
• Mixture-related or airflow fault codes.
• Poor engine response.
• Increased crankcase pressure.
• Oil vapour or fumes around the engine compartment.
• Smoke from the exhaust in some cases if the ventilation system is malfunctioning.

These symptoms are not exclusive to the breather line. Faults with the crankcase ventilation valves, oil separator, intake system or associated hoses can produce similar symptoms and should also be checked.

Why Replacement Matters:
The engine breather system needs to remain sealed and unrestricted to regulate crankcase pressure correctly.

If the breather line cracks or becomes disconnected, unwanted air can enter the system while crankcase vapours may escape through an unintended path.

If the line becomes blocked or restricted, crankcase pressure may increase.

Replacing a faulty breather line helps restore:

• Correct crankcase ventilation.
• Proper pressure regulation.
• A sealed engine ventilation circuit.
• More consistent engine operation.
• Correct routing of oil vapours and blow-by gases.
• Reduced risk of pressure-related oil leaks.
• Reliable operation of associated PCV components.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

94810524551

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