Mercedes W212 Oil Seperator Engine Breather Pipe A2780100431

The Mercedes W212 Oil Separator Breather Hose is an original crankcase ventilation system component designed for Mercedes W212 engines. Thanks to its factory-matched geometry and fit, the hose ensures stable oil vapor drainage, supporting proper engine operation and reducing the risk of leaks. This is a practical solution for users who want to restore correct crankcase ventilation system functionality while adhering to manufacturer standards.

Specifications and technical data

• SKU: A2780100431
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2780100431
• Substitutable numbers: A2780100431, A 278 010 04 31
• Category: Hoses, Lines & Pipes

Purpose and Technical Function

The oil separator breather hose operates in a critical area of the crankcase ventilation system, responsible for the controlled drainage of oil vapors from the engine into the intake system. A correctly selected component in this location:

• stabilizes crankcase pressure,
• limits oil ingress into the intake system,
• reduces the risk of leaks and contamination in the engine bay,
• supports smooth, predictable engine operation.

In case of wear, cracks, or delamination of the hose, leaks, reduced engine running smoothness, and diagnostic errors may occur, making replacement with a functional OEM part technically justified.

Original Origin and Fitment

This component belongs to the Hoses, Tubes, and Pipes group and was designed specifically for Mercedes' engineering requirements. This means:

• factory-matched fit for mounting points and routing within the engine bay,
• compatibility with the original oil separator and other crankcase ventilation system components,
• appropriately selected flexibility and resistance to temperature and contact with engine oil.

This ensures a predictable installation process without the need for modifications or compromises with workshop solutions.

Condition and Service Application

The hose is offered as a used part, allowing for economical repair while maintaining original manufacturer specifications. This is a sensible choice in situations where:

• the existing hose is cracked, brittle, or leaking,
• there are issues with oil vapor drainage,
• a quick replacement is necessary while maintaining factory manufacturing standards.

A correctly fitted breather hose helps to mitigate secondary problems such as excessive intake manifold oiling or unstable idle speeds.

Benefits of Choosing an Original Hose

By choosing this part, you gain:

• compatibility with the Mercedes W212 engine system without the need for adaptation,
• preservation of the original hose routing, which facilitates servicing and diagnostics,
• consistency with other components of the crankcase ventilation and oil separation system.

This solution is particularly beneficial for workshops and users who prioritize technically correct, predictable repairs in line with manufacturer specifications.

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 crankcase ventilation hoses, vacuum hoses, or coolant pipes, check the available parts in the Mercedes Hoses, Tubes, and Pipes category.

For users who consciously choose used parts and want to better understand their impact on the environment and operating costs, we recommend the article Circular Economy in Your Garage – How Used Parts Support Ecology and Driver Budgets, which describes the practical advantages of reusing automotive components.