This is the BEMWQ Ventilation Valve (Part Number: 2730160134 / A2730160134), commonly referred to as the Crankcase Vent Valve or Oil Separator. It is a critical component of the Positive Crankcase Ventilation (PCV) system, designed for Mercedes-Benz vehicles equipped with the M273 V8 engine. Mounted on or connected to the engine (often on the cylinder head cover side), this valve regulates the flow of blow-by gases and separates oil vapor from the air, routing cleaned gases back into the intake manifold for re-combustion while returning oil to the sump. This process relieves crankcase pressure, reduces harmful emissions, and prevents oil sludge buildup .

• Precision Fitment:​ Specifically engineered for Mercedes-Benz chassis models including CLS (C219), GL (X164), G-Class (W463), M-Class (W164), E-Class (W211), and others with M273 engines, ensuring a direct OEM-standard fit without modification .

• Integrated Oil Separation:​ Designed with internal labyrinth or membrane structures (depending on specific design iteration) to effectively separate oil droplets from the crankcase air, preventing excessive oil from entering the intake system and being burned .

• Durable & Heat-Resistant Construction:​ Manufactured from high-quality, reinforced engineering plastics or polymers designed to withstand long-term exposure to hot engine oil vapors, fuel vapors, and high engine bay temperatures without cracking or deforming .

• Prevents Oil Leaks & Sludge:​ Replacing a clogged, stuck, or cracked valve helps relieve excessive crankcase pressure, which is a common cause of blown rear main seals, valve cover gasket leaks, and accelerated engine oil sludge formation .

• Restores Engine Performance:​ Ensures proper crankcase breathing and vacuum control, which helps eliminate rough idling, reduce excessive oil consumption (burning oil), and prevent check engine lights related to lean fuel mixture codes or emission faults .

• Direct Replacement:​ Matches the original part's mounting points and interface exactly, allowing for a secure and straightforward installation for both professional mechanics and DIY enthusiasts performing engine breathing system maintenance .