Audi A4 B8 A5 8T Oil Pipe Automatic Gearbox Cooler Line 2.7 TDI 8K0317825AC

Audi A4 B8 A5 8T Oil Pipe Automatic Gearbox Cooler Line 2.7 TDI is an original component from the Cooling system pipes and hoses group, designed for use with the automatic transmission in 2.7 TDI diesel units. It ensures stable transmission fluid flow, which translates into safe gearbox operation and predictable drivetrain performance in daily use.

Specifications and technical data

• SKU: 8K0317825AA
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K0317825AA
• Substitutable numbers: 8K0 317 825 AA, 8K0317825AA, 8K0 317 825 AE, 8K0317825AE
• Gearbox type: Automatic
• Category: Coolant Hoses

Purpose and technical function

The gearbox oil pipe in Audi A4 B8 and Audi A5 8T models with the 2.7 TDI engine is responsible for the controlled flow of the working medium between the lubrication and cooling system components of the automatic transmission. A properly selected and leak-free pipe reduces the risk of oil pressure drops, transmission overheating, and unwanted slipping during gear changes. This component operates at elevated temperatures and under pressure, which is why its condition has a direct impact on the durability of the entire gearbox. Replacing a worn or leaking pipe with a functional component allows for restoring stable system operating conditions and reducing the risk of costly failures.

Construction and fitment to the oil cooling system

The pipe belongs to the Cooling system pipes and hoses group, meaning it works with the transmission oil cooling circuit, dissipating excess heat from the automatic gearbox. The pipe's design is profiled for specific routing in the engine bay of the Audi A4 B8 and A5 8T, which facilitates installation and minimizes the risk of rubbing against other components. Its original Audi origin helps maintain factory geometry, the correct internal diameter, and the proper flow characteristics. As a result, the automatic transmission oil cooling system can operate within parameters close to factory specifications, and the user retains predictable transmission performance during city and highway driving.

Benefits of using an original oil pipe

Using a gearbox oil pipe dedicated to a specific drivetrain configuration provides a number of practical benefits:

• maintaining proper oil flow in the automatic gearbox,
• supporting effective transmission cooling under high-load conditions,
• reducing the risk of leaks and pressure drops in the system,
• better gearbox stability during gear changes,
• installation consistent with factory pipe routing in the engine bay. For the user, this means more predictable drivetrain operation, a lower risk of overheating, and the ability to maintain driving characteristics consistent with the manufacturer's design. In the case of automatic transmissions in Audi vehicles, maintaining the appropriate oil temperature and cleanliness is particularly important, and a functional oil pipe is one of the key elements of this system.

Condition, verification, and service application

The offered pipe comes from dismantling and is a used component, which allows for an economical repair of the system while maintaining original Audi specifications. This type of component is often chosen in situations where oil leaks are found in the gearbox area, signs of corrosion on the connectors, or mechanical damage to the pipe. Before installation, a standard service procedure is recommended: checking the tightness of connections, verifying the condition of seals, and checking the level and quality of the transmission oil after the work is completed. A properly performed gearbox oil pipe replacement helps stabilize the automatic transmission's operation and reduce the risk of further malfunctions related to overheating or insufficient lubrication.

Technical support and selection of cooling system components

If you want to better understand how the cooling circuit affects the durability of the power unit and transmission, it is worth checking out our guide describing typical overheating problems and the role of radiators and pipes in protecting the engine and gearbox: Engine cooling system – overheating, repair, and used radiators. If you are planning a comprehensive repair or upgrade of the gearbox oil cooling area in your Audi and need other elements from the same group, such as flexible hoses, rigid pipes, or additional sections carrying the working medium, check the available parts in the Audi cooling system pipes and hoses category. To maintain the consistency of the car's character, you can also read our material dedicated to the role of original components in preserving the driving properties and quality of vehicles of this brand: how used Audi parts help maintain the brand's DNA.