Mercedes W168 OM668 Diesel Vent Pipe Engine Crankcase Breather Hose A6680100382

Mercedes W168 OM668 Diesel Vent Pipe Engine Crankcase Breather Hose is a precisely engineered component of the crankcase ventilation system for OM668 diesel engines used in the A-Class W168. It is responsible for the controlled flow of oil vapors, which promotes stable engine operation and reduces intake contamination. Thanks to its perfect fit for the specific design of the OM668 diesel engine, this hose ensures a secure seal, proper gas circulation, and long-term reliability.

Specifications and technical data

• SKU: A6680100382
• Mark: Mercedes (Genuine OE)
• Condition: New
• OEM Part Number: A6680100382
• Substitutable numbers: A6680100382, A 668 010 03 82
• Fuel type: Diesel
• Category: Hoses, Lines & Pipes

Purpose and technical function

The breather hose in a diesel engine plays a key role in managing blow-by gases that enter the crankcase. In the OM668 units used in the Mercedes W168, it is responsible for:

• discharging oil vapors from inside the engine to the intake system,
• maintaining stable pressure in the crankcase,
• limiting oil leaks resulting from overpressure,
• reducing the accumulation of deposits in the intake manifold.

A properly selected breather hose in a diesel engine translates into smooth engine operation, reduced exhaust smoke, and more predictable engine behavior under load.

Design and fitment for Mercedes W168 OM668

The hose has been designed specifically for the ventilation system in OM668 engines used in the Mercedes A-Class W168. This means that its geometry, connection diameters, and routing are adapted to the factory layout in the engine bay. This solution ensures:

• secure seating on the ventilation and intake system ports,
• appropriate flexibility while maintaining shape stability,
• minimization of the risk of abrasion and leaks during operation.

As a result, installation is straightforward, without the need for modifications or the use of additional clamps beyond those provided in the vehicle. Precise fitment for the specific model and engine type reduces the risk of installation errors and speeds up maintenance.

Benefits of replacing the breather hose in a diesel engine

In diesel engines, especially those operated in urban conditions, the breather hose is exposed to oil, high temperatures, and pulsating pressure. Over time, this can lead to micro-cracks, delamination, and leaks. Replacing it with a new component brings measurable benefits:

• reduction of oil leaks and dirt in the engine bay,
• reduced risk of "false air" being sucked into the intake,
• more stable idle performance,
• better protection of intake components against excessive oiling.

In the case of OM668 units, a properly functioning ventilation system has a significant impact on diesel engine refinement, turbocharger longevity, and the cleanliness of the intake system.

Professional installation and practical application

When replacing the breather hose, it is recommended to thoroughly clean the connection ports and check the other components of the ventilation system. A correctly installed hose:

• operates without tension or kinks along its entire length,
• maintains connection tightness across the full range of operating temperatures,
• ensures predictable gas flow, consistent with the OM668 design specifications.

This approach allows you to fully utilize the potential of the new component and represents an important stage of preventive maintenance for a diesel engine.

Expanding your Mercedes hose system service

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, cooling system hoses, or supply pipes, check out the available parts in the Mercedes Hoses, Pipes and Tubes category.