Mercedes W204 C207 S212 Gearbox Oil Cooler Cooling Line Hose Tube A6421806930

Mercedes W204 C207 S212 Gearbox Oil Cooler Cooling Line Hose Tube is an original component from the Oil coolers and lines group, designed for the automatic transmission lubrication system in Mercedes vehicles. This used hose allows for an economical yet technically correct repair of the oil circuit between the gearbox and the cooler, maintaining the factory geometry of the working medium routing.

Specifications and technical data

• SKU: A6421806930
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6421806930
• Substitutable numbers: A6421806930, A 642 180 69 30
• Part type: Oil Cooler Line
• Category: Oil Coolers & Lines

Purpose and function of the oil hose

The gearbox oil cooler hose is responsible for the safe supply and return of transmission oil to the heat exchanger, stabilizing the transmission's operating temperature. A properly selected component ensures:

• maintenance of the correct pressure in the gearbox oil circuit,
• temperature control through efficient flow through the cooler,
• reduction of the risk of overheating and decreased transmission durability,
• factory fitment to the mounting points and connectors in the specific body model.

By maintaining the original design, the hose works with the oil cooling system in the manner intended by the manufacturer, which is particularly important in premium class vehicles.

Benefits of using an original Mercedes hose

Using an original oil hose in the gearbox cooling system of a Mercedes translates into a number of practical benefits. An element from this group:

• maintains the factory routing, which minimizes the risk of abrasion and vibration,
• ensures compatibility with existing brackets and mounting clamps,
• reduces the possibility of leaks at connections thanks to matched ends,
• facilitates diagnostics and service, as the design is well-known to workshops specializing in the brand.

Choosing an original component from the Oil coolers and lines category allows for maintaining the consistency of the entire oil cooling system, which is important for both the durability of the gearbox and the stability of operating parameters during driving in variable load conditions.

Installation and operational characteristics

The gearbox oil cooler hose in this configuration is prepared for installation in dedicated body models, while maintaining the original mounting points. In practice, this means:

• no need for modifications to the oil system,
• easier routing of the hose in the engine bay and chassis,
• preservation of appropriate bending radii, which promotes durability and tightness,
• possibility of using standard service procedures applied in authorized service centers.

The used component allows for the optimization of repair costs while maintaining a design consistent with the manufacturer's factory specifications, which is essential for systems operating under pressure and at elevated temperatures.

Condition and use in service practice

The product comes from the Mercedes brand and is classified as used, which enables economical repair of the gearbox oil cooling system without sacrificing the original design. This type of hose is often chosen by workshops specializing in automatic transmission service when it is necessary to replace a component due to leaks, external corrosion, or mechanical damage.

Selecting the correct hose is facilitated by the OEM part number and available interchangeable numbers, allowing for precise verification of compatibility with a specific vehicle configuration and avoiding installation problems.

Technical support and related system components

The gearbox oil cooling system works in close cooperation with the cooler, lines, and mounting elements. During periods of high temperatures, it is particularly important to maintain the efficiency of the entire oil circuit. You can find more about the impact of thermal conditions on the cooling system and how used components can support reasonable service cost management in our 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 lubrication and oil cooling area in your Mercedes and need other elements from the same group, such as return lines, supply sections, or additional branches to the heat exchanger, check the available parts in the Mercedes oil coolers and lines category.