Mercedes W169 Oil Separator Diesel OM640 Crankcase Breather Valve A6400101062

Mercedes W169 Oil Separator Diesel OM640 Crankcase Breather Valve is a crankcase ventilation system component, designed specifically for Mercedes diesel engines from the OM640 family. Thanks to its factory design, it ensures stable oil vapor separation, supports the proper operation of the diesel engine, and helps maintain cleanliness in the intake system. It is a practical solution for users looking for a proven OEM component instead of replacements of uncertain quality.

Specifications and technical data

• SKU: A6400101062-2
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6400101062
• Substitutable numbers: A6400101062, A 640 010 10 62
• Fuel type: Diesel
• Category: Oil Pumps & Parts

Function of the engine breather in OM640 diesel units

The engine breather in diesel units is responsible for the controlled discharge of gases from the crankcase and the separation of oil mist. In the OM640 diesel engine, a properly functioning breather:

• limits the ingress of oil into the intake system,
• supports the maintenance of stable pressure in the crankcase,
• reduces the risk of excessive exhaust smoke,
• indirectly affects the service life of the turbocharger and the intake system.

Thanks to its precise fit for the specific engine unit, the ventilation system operates in a predictable manner, which facilitates diagnostics and maintenance of the entire engine.

Purpose and fitment for Mercedes W169

The presented breather is intended for Mercedes A-Class W169 generation models with a diesel engine. The design, consistent with Mercedes factory solutions, allows for maintaining the original operating characteristics of the power unit without the need for installation modifications.

Proper fitment to the lubrication and intake system in the W169 ensures that the installation process is predictable, and the component works in harmony with other oil system parts according to the manufacturer's specifications.

Technical category – Oil pumps and parts

The engine oil breather belongs to the Oil pumps and parts group, which includes elements directly related to oil circulation and oil management in the engine. Replacing this component is particularly important in the case of:

• a noticeable increase in oil consumption,
• excessive oiling of intake hoses,
• problems with the smooth operation of the diesel unit,
• preventive maintenance at higher mileages.

Selecting a component from the same technical group allows for maintaining the consistency of the lubrication system and reducing the risk of undesirable phenomena, such as blow-by or unstable crankcase pressure.

Characteristics of the used component

The offered breather is a used part, which in practice means the possibility of an economical repair of the ventilation system while maintaining the original Mercedes design. In many cases, using a proven component from disassembly is a reasonable alternative to cheap replacements of uncertain durability.

Before installation, it is recommended to perform a standard check of the condition of hoses, seals, and system patency to fully utilize the potential of the installed component and avoid secondary leaks.

Technical support and additional information

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other elements from the same group, such as oil pump housings, covers, or additional modules related to oil circulation, check the available parts in the Mercedes Oil pumps and parts category.

For users interested in the operation of all-wheel-drive systems in cars of this brand and the impact of the lubrication system's condition on the durability of drivetrain components, an article comparing different AWD systems may be helpful – you can find it here: xDrive, 4Matic, quattro or 4Motion – a comparison of AWD drives from BMW, Mercedes, Audi and VW.