Mercedes W168 OM668 Diesel Oil Separator Breather A6680100062

Mercedes W168 OM668 Diesel Oil Separator Breather is a specialized component of the crankcase ventilation system in diesel engines, designed to ensure stable operation of the power unit. A properly selected breather limits the ingress of oil into the intake system, supports exhaust cleanliness, and helps maintain uniform pressure within the engine. By choosing this component, you gain a technically matched solution for the OM668 unit in the Mercedes W168 model, as well as consistency with the factory lubrication system design.

Specifications and technical data

• SKU: A6680100062
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6680100062
• Substitutable numbers: A6680100062, A 668 010 00 62, 0928400503, 0 928 400 503
• Fuel type: Diesel
• Category: Oil Filters

Function and role of the oil breather in the OM668 diesel engine

The oil breather in a diesel engine plays a key role in controlling blow-by gases and managing oil vapors. In diesel units such as the OM668, a properly functioning breather:

• stabilizes pressure in the crankcase, which promotes smooth engine operation,
• limits the passage of oil mist into the intake system,
• supports the maintenance of proper cleanliness of the intake manifold and cooperating components,
• indirectly influences engine refinement and fuel economy.

Thanks to its proper design, this element works with the lubrication and intake systems in the manner intended by the manufacturer, which is particularly important in modern diesel units.

Compatibility with Mercedes W168 and the OM668 unit

The presented breather has been designed for use in the Mercedes W168 with the OM668 engine, which is a compact diesel construction used in the first-generation A-Class. Using a component consistent with factory specifications allows for maintaining:

• proper cooperation with the lubrication and gas recirculation system,
• appropriate routing of oil vapors in both urban and extra-urban driving conditions,
• consistency with the engine control unit maps intended for this configuration.

For users who want to maintain the original performance characteristics of the power unit, using a breather dedicated to a specific model and fuel type is a technically sound solution.

Technical characteristics and purpose

The oil breather from this offer belongs to the Oil filters group, as its task is to separate oil particles from blow-by gases and ensure their proper discharge. In a diesel engine, it is particularly important that this element:

• ensures effective separation of oil mist under various loads,
• is adapted to the specifics of diesel unit operation (higher pressures, different blow-by characteristics),
• maintains stable flow parameters over a long service life.

A crankcase ventilation system configured in this way helps to limit excessive oil consumption and reduce the risk of intake system contamination, which is significant for both durability and maintaining factory performance.

Condition, selection, and practical application

The offered oil breather is an aftermarket component, which allows for the cost-effective restoration of the ventilation system's efficiency in your Mercedes. When selecting, it is worth paying attention to:

• compatibility with the OM668 power unit,
• intended use for a diesel-powered engine,
• installation in the W168 body, in accordance with the factory accessory layout.

This approach minimizes the risk of fitment issues and reduces the need for installation modifications. Using the correct breather can help reduce symptoms such as excessive smoke, increased oil consumption, or unstable idle speed resulting from improper crankcase ventilation.

Technical support, operation, and related systems

The crankcase ventilation system works in conjunction with other engine systems, including the cooling and lubrication systems. In the case of diesel units, overheating or improper operating temperature can accelerate oil degradation, thereby affecting the quantity and nature of vapors discharged through the breather. It is worth familiarizing yourself with practical tips regarding the control of unit operating temperature and the impact of cooling on engine durability, described in the article Engine cooling system – overheating, repair, and used radiators.

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 filter cartridges, housings, or additional separation elements, check the available parts in the Mercedes Oil filters category.