Oil Cooler Pipe Audi A4 S4 B8 A5 8T Power Steering Hose Line Diesel 8K0422887AL

The Power Steering Oil Cooler Hose for Audi A4 / S4 B8 and A5 8T Diesel Engines is an original hydraulic component designed for use in the factory power steering system. Thanks to its precise fit for specific Audi model generations, it ensures stable operating pressure, proper oil cooling, and predictable vehicle handling. This is a solution for users who want to maintain compliance with factory specifications and avoid issues with leaks or improper hose routing.

Specifications and technical data

• SKU: 8K0422887AL
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K0422887AL
• Substitutable numbers: 8K0422887AL, 8K0 422 887 AL
• Fuel type: Diesel
• Category: Power Steering Pumps

Purpose and Function in the Power Steering System

The described hose is a component of the hydraulic system responsible for transporting oil between the power steering pump, the oil cooler, and other components. In diesel engine vehicles, it operates under increased thermal loads, making its proper construction crucial for maintaining the correct temperature of the working fluid. Proper oil flow translates to smooth steering gear operation, reduced pump load, and stable power steering performance during maneuvering and high-speed driving.

Benefits of Using an Original Hose

Using an original power steering oil cooler hose in Audi A4 / S4 B8 and A5 8T models helps maintain the factory routing geometry, minimizing the risk of chafing, vibrations, and improper positioning relative to other components in the engine bay. Appropriately selected hose diameters and shapes support correct hydraulic system pressure and efficiency, which is important for both driver comfort and the longevity of the power steering pump and steering gear.

This type of component is particularly important in diesel-powered vehicles, where prolonged operation under load requires effective heat dissipation from the oil. A functional oil cooler hose helps reduce overheating of the working fluid, thereby lowering the risk of power steering performance drops and accelerated wear of other hydraulic components.

Part Selection by Manufacturer Markings

When selecting a power steering oil cooler hose for an Audi, it is crucial to compare manufacturer markings and reference numbers with the vehicle's data. Verification by factory numbers helps avoid compatibility issues, such as differences in length, connection diameter, or mounting method to the body and oil cooler. This ensures a smoother installation, and the component operates according to the manufacturer's design specifications after installation.

If in doubt, it is advisable to cross-reference the markings with service documentation or a parts catalog to confirm compatibility with the specific diesel engine version and body generation. This approach reduces the risk of repeated disassembly and replacement with a different hose variant.

Characteristics of a Used Part

The offered power steering oil cooler hose is a used part, sourced from disassembly. Such a part, provided it maintains adequate sealing and has no mechanical damage, can still ensure stable hydraulic system operation and proper oil cooling. In practice, this means the possibility of an economical repair of the power steering system while maintaining the original installation specifications.

Before installation, a standard visual inspection is recommended for any signs of corrosion, deformation, or damage to the connections, and the working fluid should be replaced according to the vehicle manufacturer's recommendations. A correctly installed hose, used with appropriately selected power steering fluid, can restore proper steering system function in diesel-powered vehicles.

Technical Support and Related Components

If you are planning a comprehensive repair or upgrade of the steering system area in your Audi and need other components from the same group, such as high-pressure hoses, return hoses, or complete hydraulic pumps, check the available parts in the Audi Power Steering Pumps category.

During service work on the diesel engine, it is also worth paying attention to the condition of the fuel supply system, as its condition affects the overall smoothness of the engine's operation and the load on its accessories. For users who want to better understand the relationships between individual components, an article describing diagnostics, selection by manufacturer markings, and operating principles may be helpful – detailed information can be found in the material Fuel System – Injectors, Pumps, and Fuel Tank: Maintenance and Repair.