Mercedes W211 OM646 Gearbox Transmission Oil Feed Pipe Hose Line A2112700984

Mercedes W211 OM646 Gearbox Transmission Oil Feed Pipe Hose Line is an original component of the transmission lubrication system, belonging to the Oil coolers and lines group. Designed specifically for the OM646 engine and automatic transmission, it ensures stable oil flow between the gearbox and the cooler, which translates into safe drivetrain operation and reduces the risk of overheating.

Specifications and technical data

• SKU: A2112700984
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2112700984
• Substitutable numbers: A2112700984, A 211 270 09 84, A1402700091, A 140 270 00 91
• Gearbox type: Automatic
• Category: Oil Coolers & Lines

Purpose and function in the drivetrain

This oil pipe is a component dedicated to working with the automatic transmission in Mercedes E-Class W211 generation models with the OM646 engine. It is responsible for transporting transmission oil to the oil cooler and back, maintaining stable thermal conditions within the gearbox. A properly functioning pipe minimizes pressure drops, supports uniform lubrication, and helps extend the service life of the entire transmission.

Construction and technical fitment

The pipe belongs to the group of factory Mercedes components, which means precise fitment to mounting points and connectors on the gearbox and oil cooler. The shape, diameter, and connectors used are optimized for transmission oil flow in an automatic system, which reduces the risk of leaks and improper installation.

Thanks to a design that meets the manufacturer's requirements, the pipe works with the factory transmission oil cooling system, maintaining appropriate rigidity and resistance to the temperature and operating pressure typical for automatic transmissions in the Mercedes W211.

Benefits of using an original oil pipe

Using an original pipe instead of a worn or leaking component allows for the restoration of proper oil circulation in the automatic transmission. Key advantages include:

• factory fitment for the oil cooling system in the Mercedes W211 with the OM646 engine,
• maintenance of proper transmission oil flow and pressure,
• reduction of the risk of automatic transmission overheating,
• stable transmission operation under city and highway driving conditions.

An element from this group is particularly important when symptoms such as oil leaks near the transmission cooler, drops in transmission oil level, or overheating during long drives occur.

Condition, verification, and service application

The pipe comes from dismantling and is offered as a used part, which provides a cost-effective solution while maintaining factory specifications. This type of component is often chosen during preventive repairs or during automatic transmission service when the old pipe shows signs of corrosion, cracks, or leaks at the connections.

In workshops specializing in the Mercedes brand, the automatic transmission oil pipe is treated as an important component of the oil cooling system, especially in vehicles operated in urban conditions and with higher mileage.

Technical support and additional materials

During the summer season, the transmission oil cooling system operates at elevated temperatures, so it is worth taking care of the condition of the pipes and the cooler. More practical information about the impact of high temperatures on the cooling system and how to reasonably use used components can be found in the guide Summer heat vs. cooling system: used coolers and fans as a guarantee of savings.

If you are planning a comprehensive repair or upgrade of the oil cooling area in your Mercedes and need other components from the same group, such as oil pipes, oil coolers, or additional feed lines, check the available parts in the Mercedes oil coolers and lines category.