Audi R8 42 Oil Cooler Radiator Gearbox Transmission 420317021D

The Audi R8 42 gearbox oil cooler is an original drivetrain component designed to work with the automatic transmission in gasoline engine vehicles. It ensures stable transmission oil cooling, which translates to predictable gearbox operation and component protection during dynamic driving.

Specifications and technical data

• SKU: 420317021D
• Mark: Audi
• Condition: Used
• OEM Part Number: 420317021D
• Substitutable numbers: 420317021D, 420 317 021 D, 420317021A, 420 317 021 A
• Fuel type: Petrol
• Gearbox type: Automatic
• Part type: Oil Cooler
• Category: Oil Coolers & Lines

Purpose and Function in the Drivetrain

The oil cooler and lines for the Audi R8 automatic transmission are responsible for dissipating excess heat from the transmission oil during drivetrain operation. Maintaining a stable oil temperature is crucial for:

• maintaining proper operating pressure in the automatic transmission,
• reducing wear on clutch discs and hydraulic valves,
• ensuring smooth gear changes under thermal load,
• extending gearbox lifespan under sporty or intensive use conditions.

In the Audi R8 gasoline engine model, the automatic transmission oil cooler is particularly important because the engine generates high thermal loads, and the gearbox operates across a wide torque range.

Benefits of Using an Original Audi Oil Cooler

Choosing an original Audi oil cooler from the "Oil Coolers and Lines" category offers a range of practical technical benefits:

• Factory Fitment – The geometry of the connections and the placement of mounting points match the solutions used in the Audi R8, facilitating installation and reducing the risk of leaks.
• Compatibility with the Transmission Cooling System – The component works with the factory oil circuit and lines, maintaining the flow parameters specified by the manufacturer.
• Stable Heat Dissipation – The design of the core and flow channels is tailored to the characteristics of the automatic transmission in this model.
• Gearbox Operational Safety – Reducing transmission oil overheating minimizes the risk of mechatronics and friction component failures.

Condition, Verification, and Practical Application

The offered oil cooler is from the group of used Audi parts, allowing for economical repair or service of the drivetrain without compromising on an OEM component. Before reinstallation, it is recommended to:

• check the system for leaks under pressure,
• inspect the cleanliness of the flow channels for contaminants from previous use,
• replace the transmission oil according to the service procedure for the automatic transmission.

A component prepared in this way can be used for both a standard replacement of a damaged cooler and for comprehensive drivetrain regeneration in the Audi R8 with a gasoline engine.

Operation, Diagnostics, and Technical Knowledge

When experiencing symptoms such as jerking during gear changes, a decrease in gearbox smoothness, or transmission overheating warnings, the automatic transmission oil cooler is one of the components to verify. It is worth checking:

• the external condition of the core (corrosion, mechanical damage, clogged fins),
• the tightness of the connections with the oil lines,
• the oil temperature difference before and after the cooler during system operation.

For a broader understanding of the cooling system's impact on engine and gearbox durability, it is recommended to read the blog article “Engine Cooling System – Overheating, Repair, and Used Coolers”, which discusses practical aspects of diagnostics and selecting used cooling components.

Related Audi Oil Coolers and Lines

If you are looking for other components from the Audi oil coolers and lines category to expand or service your drivetrain, check out the Audi oil coolers and lines available in our store to select components tailored to your car's specific configuration.

Additional information on selecting original components and operating Audi units is also provided in the entry “The Five-Cylinder Audi Engine – A Legend from Quattro to RS3 and How to Care for It with Original Audi Parts”, which describes a practical approach to choosing used OEM parts.