Mercedes W164 W204 W212 OM642 Oil Separator Breather Hose A6420160381

Mercedes W164 W204 W212 Crankcase Ventilation Hose A6420160381 is a specialized hose from the Hoses, Tubes, and Pipes group, designed for the crankcase ventilation system in Mercedes diesel engines. This component ensures controlled flow of oil vapors and gases from the engine, promoting stable operation of the Diesel power unit and reducing the risk of leaks in the ventilation system.

Specifications and technical data

• SKU: A6420160381
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6420160381
• Substitutable numbers: A6420160381, A 642 016 03 81, BG
• Fuel type: Diesel
• Category: Hoses, Lines & Pipes

Purpose and Function in the Ventilation System

The oil breather hose in Mercedes W164, W204, and W212 models is responsible for directing gases from the crankcase to the intake system, where they are re-combusted. A correctly selected hose:

• stabilizes crankcase pressure in diesel engines,
• limits the ingress of oil vapors into the engine bay,
• supports smooth engine operation under various loads.

Thanks to its proper shape and internal diameter, the hose ensures adequate gas flow, which is important for both engine durability and the correct functioning of auxiliary components.

Construction and Fitment for Mercedes W164, W204, W212

The crankcase ventilation hose in question is a component designed for specific Mercedes engine systems, which translates to precise routing of the hose within the engine bay. The hose's construction is adapted to:

• the engine bay geometry of W164, W204, and W212 vehicles,
• the mounting points of the factory ventilation system,
• compatibility with diesel engine auxiliary components.

This precise fit facilitates installation and minimizes the risk of material stress that could lead to cracks or leaks during prolonged use.

Characteristics of a Used Part

The presented oil breather hose is a used part, meaning it has been removed from a vehicle and previously operated. This type of component offers a cost-effective solution for users seeking original fitment while maintaining reasonable service costs. In practice, this allows for:

• maintaining the original hose routing geometry,
• ensuring compatibility with the factory ventilation system,
• reducing repair costs compared to new aftermarket parts.

Benefits of Using a Dedicated Oil Breather Hose

Using the correct oil breather hose in a diesel engine provides tangible operational benefits. The most important include:

• more predictable behavior of the crankcase ventilation system,
• reduced risk of oil leaks in the ventilation area,
• better control over the amount of vapors entering the intake, which contributes to system cleanliness.

In Mercedes W164, W204, and W212 vehicles, this is particularly important for long-term operation in urban and highway conditions, where the ventilation system operates across a wide range of temperatures and loads.

Related Parts and Technical Knowledge

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other parts from the same group, such as vacuum hoses, oil hoses, or ventilation system pipes, check the available parts in the Mercedes Hoses, Tubes, and Pipes category.

For users interested in deepening their knowledge on selecting engine components, turbochargers, and intercooler systems, the practical guide from Global Parts may be helpful – BMW B58 Code, i.e., 340 HP from the Aftermarket – Pre-Purchase Checklist for Turbo and Intercooler for BMW 3 Series (G20), which discusses, among other things, the importance of correct part selection by OEM number and VIN.