Breather Pipes
Restore the engine ventilation routing on your Porsche 911 (996 / 997 series) with this genuine breather hose. This hose is located at the top of the oil cooler and connects the breather or ventilation circuit, ensuring proper air/oil vapour flow and system integrity.
Fits:
- Porsche 996 C2 3.4L 1997-08/01
- 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
Diagram Ref No 30
What This Product Does:
- The breather hose is part of the engine’s ventilation or crankcase/air-oil management system. In this case, it's described as being located at the top of the oil-cooler, which may mean it connects the crankcase ventilation or engine breather output back into the intake or another system.
- Its main function: to provide a path for gases (blow-by, vapor, pressure) from the engine or oil-cooler area back into the intake system or safe discharge path.
- The hose must withstand engine heat, pressure/vacuum cycles, vibrations, and exposure to oil or vapour, and provide a leak-free connection.
- Proper functioning helps maintain correct crankcase pressure, prevents undue pressure build-up or vacuum, helps control emissions, keeps the oil cooler circuit operating correctly, and ensures the engine’s ventilation system does not allow unintended air or oil vapour to escape or enter in the wrong way.
Symptoms Of Wear Or Failure:
- Oil vapour or smell around the engine compartment, especially near the oil cooler area or hose routing, indicating leakage of crankcase gases.
- Visible cracks, splits, brittleness, or hose collapse — old hoses can harden, crack or collapse internally causing blockage or leakage.
- Unusual engine behaviour: e.g., increased oil consumption, engine smoking slightly, or unusual intake/vacuum behaviour — if ventilation is compromised.
- Check engine or emission warnings: A compromised breather hose may lead to induction of unmetered air or vapours, affecting engine management.
- Oil cooler area contamination: Because the hose is described as located at the top of the oil cooler, if oil or vapour-contaminated deposits are visible there, the hose may be failing.
- Maintains correct engine ventilation: A good breather hose ensures proper crankcase/ventilation flow, and prevents pressure build-up or vacuum conditions that can lead to leaks or part failures (seals, gaskets).
- Protects the oil-cooler circuit and engine components: Because this hose is located at the oil-cooler top, replacing it helps ensure the oil cooler and associated hoses remain uncontaminated by vapour or oil mist escaping via degraded hoses.
- Improves reliability: Since these hoses are subject to heat, pressure and ageing, replacing them proactively avoids sudden failure, which could leave the car stranded or cause engine issues.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610623053
The product you are viewing cross references to these numbers
- Porsche 996 C2 3.4L 1997-08/01
- 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
Shop Securely
12 Month Warranty
Worldwide Delivery
Sold individually; x2 required per vehicle.
Fits:
Porsche 997-1 Carrera S 2005-08
Porsche 997-1 Carrera 4S 2006-08
Porsche 997-1 Targa 4S 2007-08
Diagram ref. 10.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710753800
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
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 911 - 1978 to 1989
Porsche 964 - 1989 to 1994
Porsche 993 - 1994 to 1998
Porsche 986 Boxster - 1997 to 2004
Porsche 996 - 1997 to 2005
Porsche 997.1 - 2005 to 2008
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99951255400
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
- Porsche 996 C2 3.4L 1997-08/01
- 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 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- 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
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 2007-09
- Porsche 997 MK1 GT2 2007-09
Shop Securely
12 Month Warranty
Worldwide Delivery
Engine Oil System Breather Pipes – Precision Ventilation for Porsche Performance
The engine oil breather system plays a crucial role in maintaining internal pressure balance, oil circulation, and overall engine health. The breather pipes allow gases, vapour, and excess pressure to escape from the crankcase, preventing oil contamination, leaks, and performance loss.
At Design911, we supply a comprehensive selection of oil system breather pipes and ventilation components designed for Porsche engines across all generations. Built from high-quality, oil- and heat-resistant materials, our breather pipes are engineered for long service life, durability, and a direct-fit installation — ensuring your Porsche continues to run smoothly under all driving conditions.
Whether you’re maintaining a daily-driven 911 or restoring a classic air-cooled model, our breather pipes help safeguard your engine’s lubrication system and performance.
What Do Engine Oil Breather Pipes Do?
Oil breather pipes are essential to the proper function of your Porsche’s oil system. They manage pressure and vapour within the crankcase, ensuring oil flow remains consistent and clean.
Core Functions:
- Vent
crankcase pressure to maintain oil system stability.
- Prevent
oil leaks by balancing internal engine pressure.
- Reduce
contamination by separating oil vapour from blow-by gases.
- Improve efficiency by maintaining clean airflow and optimal oil return.
Properly functioning breather pipes ensure your Porsche’s engine stays free of excessive pressure and sludge build-up, promoting smooth operation and extended engine life.
Why Do Oil Breather Pipes Fail?
Over time, breather pipes are exposed to intense heat, oil vapour, and pressure changes that can cause deterioration and leaks.
Common Causes of Failure Include:
- Cracking
or hardening of rubber or plastic due to heat cycles.
- Oil
residue build-up, leading to restricted airflow.
- Blockages
caused by sludge or carbon deposits.
- Loose
fittings or seals allowing air or oil leaks.
- Age-related wear in high-mileage or older engines.
Symptoms of failing breather pipes include oil leaks, rough idling, increased crankcase pressure, or smoke from the exhaust — all signs that the ventilation system is compromised.
Why Replace with Precision-Engineered Breather Pipes?
Replacing worn or damaged breather pipes is essential for maintaining optimal oil pressure and engine performance. Our precision-fit, high-durability replacements are designed to restore proper ventilation and prevent costly oil-related issues.
Key Benefits:
- Restores optimal crankcase ventilation and pressure control.
- Prevents oil leaks and blow-by contamination.
- Improves idle stability and engine efficiency.
- Constructed from heat- and oil-resistant materials.
- Direct-fit
compatibility for classic and modern Porsche engines.
- Ideal for regular maintenance or full engine rebuilds.
These parts are engineered to deliver long-term reliability and protect your Porsche’s engine from unnecessary wear.
Highlights:
- Precision-engineered oil breather pipes for Porsche engines.
- High-quality
materials for maximum durability and heat resistance.
- Direct-fit
replacements ensuring leak-free performance.
- Improves oil system efficiency and longevity.
- Compatible with air-cooled and water-cooled Porsche models.
- Perfect for rebuilds, maintenance, or performance upgrades.
