Audi A8 D4 Gearbox Oil Pressure Feed Pipe Line Automatic 3.0 TDI 4H0317818H

Audi A8 D4 Gearbox Oil Pressure Feed Pipe Line Automatic is an original automatic transmission system component responsible for the stable delivery of oil at the correct pressure. Thanks to its precise fit for the specific design of the A8 D4 model with a petrol engine, it ensures proper operation of the automatic transmission and reduces the risk of leaks and pressure drops in the oil circuit.

Specifications and technical data

• SKU: 4H0317818H
• Mark: Audi
• Condition: Used
• OEM Part Number: 4H0317818H
• Substitutable numbers: 4H0317818H, 4H0 317 818 H
• Fuel type: Petrol
• Gearbox type: Automatic
• Category: Oil Coolers & Lines

Function and role in the automatic transmission system

The described pressure pipe is a component of the automatic transmission lubrication and cooling system, which transports oil with the appropriate efficiency between the gearbox and other components. Stable oil pressure is crucial for:

• smooth gear shifting without jerking,
• maintaining proper lubrication of internal components,
• reducing transmission overheating under higher loads,
• increasing the durability of the entire drivetrain.

Thanks to its design in accordance with Audi factory standards, the pipe works with the automatic transmission control system, supporting the stable operation of hydraulic valves and multi-plate clutches.

Designed for Audi A8 D4 with a petrol engine

The pipe has been designed specifically for the Audi A8 D4 generation model with a petrol engine, which guarantees full compatibility with the factory drivetrain. The fitment for the specific body, engine, and automatic transmission configuration means:

• proper routing of the pipe in the engine bay and undercarriage,
• compliance with original mounting points,
• appropriate connection diameters and seals,
• no need for modifications or adaptations during installation.

Such a solution is particularly important in high-end vehicles, where the drivetrain operates under heavy load and assembly tolerances are strictly defined by the manufacturer.

Technical category: Oil coolers and lines

The item belongs to the Oil coolers and lines group, i.e., components responsible for the circulation and dissipation of heat from the oil working in the gearbox. In practice, this means that the pipe is part of a system that:

• maintains a stable transmission oil temperature,
• prevents the loss of lubricating properties at high temperatures,
• protects friction and hydraulic elements against accelerated wear.

The proper condition of oil lines has a direct impact on the service life of the automatic transmission, which is why their regular inspection and replacement of worn components is recommended during vehicle servicing.

Characteristics of the used part

The offered pipe is a used part, sourced from dismantling, which allows for an economical repair while maintaining original manufacturing quality. In practice, this means:

• factory fitment for the Audi A8 D4 oil system,
• preservation of the original geometry and shape of the pipe,
• possibility of installation as a replacement for a damaged or leaking component.

Before installation, it is recommended to perform a standard inspection of tightness, the condition of the ends, and sealing surfaces to ensure trouble-free operation after replacement.

Technical support and additional information

If you are planning a comprehensive repair or upgrade of the automatic transmission oil system area in your Audi and need other elements from the same group, such as return lines, connecting sections, or components working with the oil cooler, check the available parts in the Audi oil coolers and lines category.

To better understand the impact of oil circulation and operating temperature on the durability of the powertrain and transmission, it is worth reading the guide on the cooling system and oil coolers – you will find practical tips in the article Engine cooling system – overheating, repair, and used radiators.