Rubber Engine Oil Separator Membrane for Mercedes-Benz W164 X164 W251 W221
Restores proper crankcase ventilation and prevents oil sludge buildup in your Mercedes-Benz OM642 diesel engine. This replacement membrane installs directly into the fuel-tank heater valve housing, sealing combustion gases while redirecting blow-by vapors efficiently. Built from resilient rubber with a precise 70 mm gasket diameter, it maintains accurate airflow calibration to eliminate rough idling, reduce black smoke, and restore factory fuel economy.
Benefits & Maintenance Tips
- Replace during scheduled service intervals to clear persistent P0299 or crankcase pressure fault codes caused by a cracked diaphragm.
- Clean the surrounding mounting surfaces thoroughly before fitting to guarantee a leak-free seal and stable vacuum control.
- Inspect the connected breather hoses when swapping the membrane; replacing both components extends overall system longevity.
Technical Specifications
- Material: Automotive-grade rubber compound
- Gasket Outer Diameter: 70 mm
- Seal Type: Hermetically closed diaphragm for optimized gas separation
- Compatible OEM References: A642 010 02 91, A642 010 19 91, A646 010 00 91, A611 016 03 34, A611 016 01 34, plus matching cross-part numbers
- Fits Platforms: W164, X164, W203, W204, W211, W219, W221, W251, W906, and W463 models using 2.7L and 3.0L V6 diesel engines
Package Includes
- One (1) Rubber Engine Oil Separator Membrane
Installation Reminder
Always verify the original part number before purchase, as production changes occurred across different chassis years. Handle the new membrane with clean hands to avoid transferring oils that could degrade the rubber seal prematurely.
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