Crankcase Ventilation Membrane Rubber For Audi Passat Skoda Superb

Restore proper crankcase ventilation and protect your engine's internal seals with this direct-replacement membrane designed for select VAG group applications. Over time, the ventilation diaphragm behind the engine valve cover can harden, crack, or fail, allowing unmetered air to enter the intake or causing excessive pressure that leads to oil leaks. This replacement component recreates a hermetic seal matched to factory dimensions, ensuring balanced pressure regulation, improved fuel efficiency, and smooth idle performance for restored breathability.

Built for long-term durability, the membrane combines robust rubber layers with structural reinforcement to resist thermal cycling and chemical exposure common in modern diesels and petrol engines. It installs directly into the valve cover assembly without modification, providing a precise fit that eliminates gaps at the source. Users experiencing whistling noises from the engine bay, noticeable oil residue around the cover cap, or erratic fuel trims due to unregulated vapors will find this part addresses the root cause efficiently. Compatibility includes models such as the Audi A4, A6 C5, Skoda Superb, and multiple Volkswagen Passat generations, covering a wide range of service intervals where this specific ventilation unit degrades.

Benefits & Usage Tips

• Confirm Part Number Match: Fitment relies on exact correspondence. Compare the stamping or label on your existing membrane against the provided OEM numbers before purchasing. Some vehicles share body styles but use different ventilation codes, so visual confirmation is essential.
• Clean Seating Surfaces: When removing the old valve cover cap, remove any cured silicone or carbon deposits from the mating surface. A clean foundation ensures the new membrane sits flush, preventing vacuum leaks that can trigger hesitation during acceleration.
• Monitor Post-Repair Performance: After installation, start the engine and listen for changes in idle character. The repair often restores normal combustion balance instantly, reducing smoke emissions and stabilizing RPM fluctuations caused by previously compromised crankcase flow.

Product Specifications

• Component Type: Crankcase Ventilation Membrane / Valve Cover Diaphragm
• Construction: Heavy-duty Rubber and Plastic composite optimized for sealing
• Sealing Design: Hermetically closed mechanism to separate oil vapors from fresh airflow
• OEM Reference Numbers: 046198475B, 046103527A, 046103527, 046103359E, 353102176, 046198475, 046198475A, 059115405G
• Other Reference Codes: F718202210130, 4288807, 04288807, F718202210050, F76201210570, BF6M2013
• Placement: Front side engine, integrated into valve cover assembly
• Origin: Mainland China
• Condition: Brand New

Package Includes

One (1) Crankcase Ventilation Membrane tailored for specified Audi, Skoda, and Volkswagen engine configurations.

Important Notes

Compatibility Disclaimer: Vehicle application data serves only as a reference guide. You must verify the hardware designation against your original part before ordering. Purchasing the incorrect variant will result in improper fitment or leakage, potentially requiring additional labor costs for unsuitable units.