Mercedes W204 W212 Diesel OM642 Oil Seperator Engine Breather Pipe A6420160881

Mercedes W204 W212 Diesel OM642 Oil Seperator Engine Breather Pipe is an original crankcase ventilation system component designed for OM642 diesel engines. Thanks to its factory geometry and precise fitment, it ensures stable oil vapor discharge and proper operation of the intake system in diesel units. It is a practical service solution for users who want to maintain consistency with the original Mercedes design.

Specifications and technical data

• SKU: A6420160881-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6420160881
• Substitutable numbers: A6420160881, A 642 016 08 81
• Fuel type: Diesel
• Category: Hoses, Lines & Pipes

Purpose and technical function

The breather pipe in the OM642 diesel engine is responsible for the controlled discharge of gases from the crankcase into the intake system, where they are re-burned. A properly selected component of this type:

• reduces the risk of excessive oil contamination in the intake and engine accessories,
• supports the maintenance of stable pressure in the crankcase,
• helps reduce pollutant emissions in accordance with the design specifications of the diesel unit.

In the case of OM642 diesel engines, the proper condition of the breather pipe is crucial for the smooth operation of the unit, the correct functioning of the oil separator, and the reduction of leaks and blow-by.

Construction and fitment for Mercedes W204 / W212

The offered pipe belongs to the Lines, hoses and pipes group, which means it has been designed as a component of the fluid flow system in the engine bay. Its shape and connection diameters are adapted to the architecture of the OM642 unit installed in Mercedes C-Class (W204) and E-Class (W212) models with diesel engines.

Factory fitment translates into:

• a secure connection with the oil separator and other system components,
• proper routing of the pipe in the engine bay, without tension or unnatural bends,
• preservation of the original oil vapor flow path.

Benefits of using an original breather pipe

Using a breather pipe dedicated to the OM642 engine in a Mercedes W204 / W212 allows you to maintain the engine's operating parameters in accordance with the manufacturer's specifications. In practice, this means:

• more predictable diesel engine behavior under various load conditions,
• reduced risk of leaks in the ventilation system,
• easier diagnostics of potential service issues, as the system remains consistent with the factory configuration.

A used component can be a reasonable choice for maintenance repairs when the priority is to maintain the original design at optimal service costs.

Condition and service application

The product comes from the Mercedes brand and is classified as a used part, making it an attractive alternative to new replacements for standard breather system repairs. It is particularly useful for:

• replacing a damaged or leaking breather pipe,
• comprehensive service of the crankcase ventilation system in a diesel engine,
• restoring the factory configuration after previous modifications.

Service expansion and additional information

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other components from the same group, such as vacuum lines, breather hoses, or intake pipes, check the available parts in the Mercedes lines, hoses and pipes category.

When planning broader service work, it is also worth checking out practical tips on selecting and installing used electronic components and sensors – you will find them in our guide: Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?.