Mercedes W203 OM612 Oil Separator Crankcase Vent Valve Pipe Hose A6120160081

Mercedes W203 OM612 Oil Separator Crankcase Vent Valve Pipe Hose is an item from the Lines, hoses and pipes group, designed for the crankcase ventilation system in the OM612 engine. A properly selected breather hose stabilizes engine operation, reduces blow-by, and helps maintain correct combustion parameters. This component allows for a technically correct replacement of a worn hose in the breather system of Mercedes W203 models with the OM612 engine.

Specifications and technical data

• SKU: A6120161181
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6120161181
• Substitutable numbers: A6120161181, A 612 016 11 81, A6120160081, A 612 016 00 81
• Category: Hoses, Lines & Pipes

Purpose and function of the breather hose

The breather hose in the OM612 engine is responsible for the controlled discharge of gases from the crankcase to the intake system. A properly functioning hose:

• ensures stable pressure in the crankcase,
• reduces oil leaks and contamination in the engine bay,
• supports smooth engine operation across the full load range.

Thanks to its tailored geometry and diameter, the breather pipe in the version dedicated to the OM612 allows for maintaining the factory gas flow characteristics, which is important for engine durability and the correct operation of accessories.

Construction and fitment for Mercedes W203 OM612

The presented hose belongs to the Lines, hoses and pipes group, which means it has been designed to operate in the oil-exhaust environment typical for a breather system. The shape and connection points are adapted to the architecture of the OM612 engine in the W203 body, which facilitates installation in the original brackets and sockets.

The element is prepared as a replacement for the factory-fitted breather hose, making it suitable for:

• replacing a worn or brittle hose,
• eliminating leaks in the ventilation system,
• preventive maintenance of the intake and breather system.

Product characteristics and condition

The breather hose offered in this configuration is a Mercedes brand part, which promotes proper fitment to the engine system and compatibility with factory equipment. The product is in used condition, which in practice means it comes from disassembly, and its performance parameters allow for further operation after proper installation.

Choosing a used breather hose is often a sensible solution when servicing older engines, where both correct fitment and repair cost optimization while maintaining system functionality are important.

Benefits of using a dedicated breather hose

Using the correct breather hose in the OM612 engine in the W203 body brings a number of practical benefits:

• More stable engine operation – reduction of false air and leaks in the intake system.
• Better oil consumption control – proper discharge of gases from the crankcase reduces the risk of leaks.
• Easier diagnostics – a sealed breather system makes it easier to assess the condition of other engine components.

Replacing the breather hose is particularly recommended in case of symptoms such as unstable idle speed, oiliness around the intake, or visible cracks on the existing hose.

Support with part selection and additional information

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

When selecting components for the breather system and other subassemblies, it is worth considering the differences between original, replacement, and used parts – in terms of costs, build quality, and fitment based on catalog numbers. A detailed discussion of these issues can be found in the article Original, replacement or used – which car parts are the most cost-effective?, which helps to consciously plan your vehicle's service strategy.