The BEMWQ Crankcase Ventilation Pipe (Part No.: 2740183701) is a vital engine breathing component designed for Mercedes-Benz vehicles equipped with the M274 2.0L turbocharged inline-4 engine. It is fully compatible with chassis models including the W205 (C-Class) and X253 (GLC-Class). This pipe serves as a critical conduit within the Positive Crankcase Ventilation (PCV) system, responsible for routing blow-by gases (a mixture of air, fuel vapors, and oil mist) from the engine crankcase/oil separator to the intake manifold or air intake duct for re-combustion, thereby regulating internal engine pressure and reducing emissions.

• Precision OEM Fitment: Manufactured to match the original equipment specification 2740183701 (A2740183701), ensuring exact routing, correct connector shapes, and seamless integration with the M274 engine’s ventilation ports without modification.
• Heat & Chemical Resistant Material: Typically constructed from high-grade reinforced plastic or PA 66 GF 30 (glass-filled polyamide), specifically engineered to withstand long-term exposure to high engine bay temperatures, oil vapors, and crankcase pressure cycling without becoming brittle or collapsing.
• Optimized Flow Path: Designed with smooth inner walls and precise diameters to ensure unrestricted airflow, maintaining the proper vacuum signal required for the PCV valve and oil separator to function correctly.
• Secure Connection Design: Features factory-style quick-connect fittings or molded ends that provide a tight, leak-proof seal at both the crankcase/oil separator and intake connection points to prevent unmetered air leaks.

• Prevention of Oil Leaks & Consumption: Effectively relieves excessive crankcase pressure that can otherwise force oil past gaskets and seals (causing external oil leaks) or push oil vapor into the intake tract (leading to high oil consumption, oil sludge buildup, and potential blue exhaust smoke).
• Restored Engine Idle & Performance: Eliminates rough idling, hesitation, and erratic air-fuel mixture issues often caused by a cracked, disconnected, or collapsed ventilation pipe, which allows unregulated false air to enter the engine and disrupt combustion.
• Emission Control & Engine Longevity: Ensures harmful blow-by gases are properly recirculated and burned rather than escaping into the atmosphere or contaminating the engine oil, helping the vehicle pass emission tests and extending the life of the lubricating oil.
• Cost-Effective PCV System Repair: Provides a dependable and economical solution to replace aged, hardened, or split original pipes—a common failure point on higher-mileage M274 engines—restoring the integrity of the crankcase ventilation system at a fraction of the cost of a full dealer repair.