Mercedes W211 C219 Diesel OM642 Automatic Gearbox Oil Cooler Line A6421803930

Mercedes W211 C219 Diesel OM642 Automatic Gearbox Oil Cooler Line is a specialized component of the automatic transmission oil cooling system, designed for vehicles with a diesel engine. It is responsible for the stable discharge of oil to the cooler, which supports the safe operation of the gearbox and reduces the risk of overheating. By maintaining the factory geometry of the line, it ensures proper flow of the cooling medium and predictable behavior of the drivetrain.

Specifications and technical data

• SKU: A6421803930
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6421803930
• Substitutable numbers: A6421803930, A 642 180 39 30
• Fuel type: Diesel
• Gearbox type: Automatic
• Category: Oil Coolers & Lines

Purpose and function in the drivetrain

The offered line is a component dedicated to Mercedes cars with a diesel engine and an automatic transmission, where transmission oil is directed to an external cooler. Its task is to maintain a stable connection between the gearbox and the oil cooler, which allows for efficient heat dissipation from the operating oil.

A properly selected automatic gearbox oil cooler line:

• ensures proper tightness of the oil system,
• maintains correct oil pressure and flow,
• limits fluctuations in the operating temperature of the automatic transmission,
• supports the durability of the internal components of the gearbox.

Benefits of using an original line

Using a line from the Oil coolers and lines group dedicated to a specific drivetrain configuration allows for maintaining the factory operating parameters of the system. The appropriate shaping, diameter, and type of connectors minimize the risk of installation stress, leaks, and incorrect routing of the line in the engine compartment.

Key advantages of such a solution include:

• compatibility with the automatic transmission oil system,
• stable thermal conditions for transmission oil in a diesel engine,
• compliance with the factory architecture of the OM642 drivetrain,
• reduction of the risk of failure resulting from overheating or oil pressure drops.

Operational and installation characteristics

The automatic gearbox oil cooler line in this configuration has been designed to work in the demanding thermal and pressure conditions typical of diesel units. The design of the line allows for its installation in the original mounting points, which facilitates service and reduces the time required for replacement.

In practice, this means that by following the proper service procedure, one can:

• reproduce the factory routing of the line in the engine compartment,
• maintain an appropriate distance from hot and moving parts,
• minimize the risk of chafing and mechanical damage during operation.

Why choose a used OEM component

A used automatic gearbox oil cooler line for a Mercedes is a solution that allows you to combine cost control with maintaining the original technical specification. Unlike many aftermarket replacements, an OEM component is designed for a specific model and drivetrain configuration, which translates into better fitment and predictable system behavior.

In the case of automatic transmission oil systems, it is particularly important that the line complies with factory requirements regarding diameter, type of connectors, and resistance to temperature and pressure. Choosing such a component helps reduce the risk of leaks, pressure drops, and accelerated wear of the transmission oil.

Cooling system expansion and service knowledge

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 additional lines, connecting sections, or medium-guiding elements, check the available parts in the Mercedes oil coolers and lines category.

When working with oil and coolant cooling systems, it is worth considering the impact of high temperatures on component durability. You can find more practical information on the operation and servicing of cooling components in the guide Summer heat vs. cooling system: used radiators and fans as a guarantee of savings, which helps to better plan system maintenance during the summer season.