Mercedes W204 Transimssion Oil Cooling Line Hose Tube Pipe Automatic A6421803530

Mercedes W204 Transimssion Oil Cooling Line Hose Tube Pipe Automatic is an original drivetrain component designed for use with an automatic transmission. It ensures stable heat dissipation from the transmission fluid, which translates into a safe operating temperature for the gearbox and a longer service life.

Specifications and technical data

• SKU: A6421803530
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6421803530
• Substitutable numbers: A6421803530, A 642 180 35 30
• Gearbox type: Automatic
• Category: Oil Coolers & Lines

Purpose and function in the oil cooling system

The offered hose belongs to the Oil coolers and lines group and is dedicated to Mercedes W204 class models equipped with an automatic transmission. Its task is to transport transmission fluid between the gearbox and the oil cooler, which allows for effective dissipation of excess heat from the system.

A properly functioning oil cooling hose:

• stabilizes the operating temperature of the automatic transmission,
• reduces the risk of overheating and a decrease in lubrication quality,
• supports smooth gear shifting and drivetrain refinement.

Benefits of using an original Mercedes hose

The component comes from the Mercedes brand, which means maintaining factory geometry, diameters, and connections, and thus proper fitment to the oil cooling system in the W204. The original design minimizes the risk of leaks, incorrect hose routing, or stresses resulting from an improper shape.

The main advantages of using this hose include:

• Compatibility with automatic transmission – a hose designed to work in a system with an automatic gearbox, with an appropriately selected oil flow diameter.
• Factory mounting points – facilitate installation and maintain proper hose routing in the engine bay.
• Consistency with the rest of the oil cooling system – the hose works with the factory oil cooler and other installation components.

Component condition and service application

The hose is offered as a used part, which allows for an economical repair of the oil cooling system while maintaining the manufacturer's original specifications. This type of component is particularly useful in cases of:

• mechanical damage to the existing hose (cracks, abrasions, corrosion at the connections),
• repairs after a collision in the front part of the vehicle,
• automatic transmission service combined with an inspection of the oil cooling system.

Using an original hose in good technical condition reduces the risk of transmission fluid leaks, which could lead to a drop in system pressure and accelerated wear of the gearbox.

Technical support and knowledge about the cooling system

To better understand the impact of an efficient cooling system on the durability of the powertrain and gearbox, it is worth reading the guide material regarding oil coolers and cooling systems, such as the article about the engine cooling system, overheating, and used coolers. This will allow you to consciously plan your service and select the appropriate components.

Complementary elements from the same group

If you are planning a comprehensive repair or upgrade of the 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 cooler, check the available parts in the Mercedes oil coolers and lines category.

When choosing used elements for the oil cooling and automatic transmission system, a guide comparing the differences between new parts and those from the secondary market, available in the form of an analysis regarding the cost-effectiveness of using used parts, may also be helpful. This will make it easier for you to assess when choosing a used component is technically and economically justified.