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- Porsche 911 1978-1983 3.0L / SC
Fits:
Porsche 911 1980-83
Click 'Zoom in' for large parts diagram.
Diagram ref no 35A
Related reference numbers
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93010739410
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- Porsche 958 Cayenne V6 3.6L Petrol (300Hp) 2010-17
- Porsche 970.2 Panamera S V6 Turbo 3.0L 2WD (420Hp) 2014-16
- Porsche 970.2 Panamera S V6 Turbo 3.0L 2WD Executive 2014-16
- Porsche 970.2 Panamera 4S V6 Turbo 3.0L 4WD (420Hp) 2014-16
- Porsche 970.2 Panamera 4S V6 Turbo 3.0L 4WD Executive 2014-16
- Porsche 95B.1 Macan S Petrol 3.0L V6 (340Bhp) 2014-18
- Porsche 95B.1 Macan GTS Petrol 3.0L V6 (360Bhp) 2014-18
- Porsche 95B.1 Macan Turbo 3.6L V6 (400Bhp) 2014-18
Non-Return Valve – Crankcase Oil Breather
The crankcase oil breather non-return valves is an
essential part of your Porsche’s engine ventilation system. Designed to OEM
specifications, they regulate crankcase pressure, prevent oil vapour backflow,
and ensure smooth, efficient engine operation. Replacing both valves together
restores proper crankcase breathing and protects your engine from leaks and
excess oil consumption.
Fits:
- Porsche Cayenne V6 3.6L Petrol 300Hp
- Porsche Panamera S V6 Turbo 3.0L 2WD (420Hp)
- Porsche Panamera S V6 Turbo 3.0L 2WD Executive
- Porsche Panamera 4S V6 Turbo 3.0L 4WD (420Hp)
- Porsche Panamera 4S V6 Turbo 3.0L 4WD Executive
- Porsche Macan S Petrol 3.0L V6 340Bhp
- Porsche Macan GTS Petrol 3.0L V6 360Bhp
- Porsche Macan Turbo 3.6L V6 400Bhp
What the Non Return Valves Do
- Maintain Correct Pressure: Allow gases to escape while preventing backflow into the crankcase.
- Improve Engine Efficiency: Reduce oil vapour re-entry, helping cleaner combustion.
- Protect Components: Prevent pressure build-up that can damage seals and gaskets.
Symptoms of Faulty Breather Valves
- Excessive oil consumption.
- Blue smoke from the exhaust.
- Oil leaks around gaskets and seals.
- Rough idle, misfires, or poor performance.
- Strong smell of oil fumes in the engine bay or cabin.
Common Reasons for Failure
- Oil Sludge & Contamination: Causes the valve to stick open or closed.
- Rubber & Spring Wear: Degradation over time reduces effectiveness.
- Lack of Maintenance: Old oil accelerates valve failure.
- High Mileage Stress: Heat cycles and pressure changes weaken components.
Why Replace?
Restores proper crankcase ventilation.
Prevents oil leaks and excess pressure in the engine.
Reduces harmful emissions and oil consumption.
Protects seals, gaskets, and other critical engine parts.
Improves reliability, performance, and long-term durability.
Why Buy from Design 911?
- Specialist Supplier: We are Porsche parts experts with years of experience.
- OEM Quality & Fitment: Parts meet or exceed original specifications.
- Trusted Worldwide: Thousands of Porsche owners and workshops rely on us.
- Comprehensive Support: Expert advice, fast shipping, and hassle-free service.
- One-Stop Shop: Whether it’s engine, body, or interior components, Design 911 has you covered.
Ideal For: Replacing worn crankcase valves during servicing or resolving oil consumption, leaks, or performance issues.
Related reference numbers
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9461072
The product you are viewing cross references to these numbers
- Porsche 958 Cayenne S V8 4.8L Petrol (400Hp) 2010-17
- Porsche 970.1 Panamera S V8 4.8L 2009-13
- Porsche 970.1 Panamera 4S V8 4.8L 2009-13
- Porsche 970.1 Panamera GTS V8 4.8L 2011-13
- Porsche 970.2 Panamera GTS V8 4.8L 4WD (440Hp) 2014-16
The Breather Line for Crankcase Housing is a OE MATCH engine ventilation component designed to regulate crankcase pressure and route blow-by gases safely through the Positive Crankcase Ventilation (PCV) system. This hose connects the crankcase housing to the appropriate intake or separator components, ensuring balanced airflow and controlled emissions.
Fits:
- Porsche 958 Cayenne S V8 4.8L Petrol (400Hp) 2010-17
- Porsche 970.1 Panamera S V8 4.8L 2009-13
- Porsche 970.1 Panamera 4S V8 4.8L 2009-13
- Porsche 970.1 Panamera GTS V8 4.8L 2011-13
- Porsche 970.2 Panamera GTS V8 4.8L 4WD (440Hp) 2014-16
Diagram Ref No 6
What This Product Does:
- Relieving excess crankcase pressure
- Routing blow-by gases back into the intake system
- Supporting correct PCV system function
- Reducing oil vapour contamination in the intake tract
- Helping prevent sludge build-up and gasket stress
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 noises (vacuum leak)
- Excessive exhaust smoke
- Oil residue around breather or intake connections
Why Replacement Matters:
- Restore proper crankcase ventilation
- Prevent oil leaks and vacuum-related issues
- 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.
94810724720
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