Description
Audi S5 8T Gearbox Transmission Oil Cooling Pipe Hose Line is an original drivetrain component designed for use with automatic transmissions in gasoline-powered vehicles. It ensures stable heat dissipation from the transmission oil, which translates into a safe operating temperature for the transmission and a longer service life.
Specifications and technical data
- SKU: 8K0317818DH
- Mark: Audi
- Condition: Used
- OEM Part Number: 8K0317818DH
- Substitutable numbers: 8K0317818DH, 8K0 317 818 DH
- Fuel type: Petrol
- Gearbox type: Automatic
- Category: Oil Coolers & Lines
Purpose and function in the drivetrain
This oil cooling pipe is a component of the system that connects the automatic transmission to the oil cooler, enabling the circulation of the working medium and effective dissipation of excess heat. In gasoline-powered vehicles, a stable transmission oil temperature is crucial for smooth gear shifting, protection of clutches and control valves, and reducing the risk of overheating during dynamic driving or operation under load.
The original Audi origin ensures the maintenance of factory flow parameters, diameter, and pipe shape, which facilitates installation at existing mounting points and ensures compatibility with the oil cooling system used in the S5 8T model.
Construction and fitment for automatic transmission
The pipe has been designed specifically for use with an automatic transmission, taking into account the operating pressures and oil temperatures characteristic of this type of gearbox. The properly routed oil line path reduces the risk of kinks, point stresses, and vibrations that could affect the tightness or durability of the connections.
The geometry of the pipe is matched to the engine bay and drivetrain of the Audi S5 8T, which allows for maintaining the proper distance from hot components (e.g., the exhaust) and moving parts. As a result, the transmission oil cooling system can operate under stable conditions, and the oil retains its proper lubricating and protective properties.
Benefits of using an original oil cooling pipe
- Factory fitment – a pipe designed for the specific drivetrain configuration of the Audi S5 8T, with no need for modifications or adaptations.
- Stable transmission oil temperature – proper flow through the oil cooler supports smooth and predictable operation of the automatic transmission.
- Reduced risk of leaks – the correct shape and length of the pipe reduce stress on the joints and the transmission/cooler ports.
- Consistency with the cooling system – the pipe works with the existing system architecture, maintaining the parameters specified by the manufacturer.
Application in Audi gasoline vehicles
In gasoline-powered cars, especially those with higher power outputs such as the Audi S5 8T, the transmission oil cooling system is an essential element ensuring repeatable gear shifting characteristics. During intensive use – highway driving, dynamic acceleration, or towing – the amount of heat generated in the transmission increases, and an efficient oil cooling pipe allows the operating parameters to be maintained within the range specified by the manufacturer.
Choosing a used, original pipe from the Oil coolers and pipes group is a beneficial solution in situations where the existing component has suffered mechanical damage, corrosion, or leaks, and the priority is to maintain the factory configuration of the drivetrain.
Condition, installation, and service aspects
The item comes from disassembly and is offered as a used part, which allows for an economical repair of the oil cooling system while maintaining the manufacturer’s original specifications. Before installation, a standard service procedure is recommended: checking the tightness of the joints, verifying the condition of the sealing surfaces, and flushing the system in accordance with the vehicle manufacturer’s guidelines.
Replacing the transmission oil cooling pipe is particularly recommended in the event of leaks, signs of abrasion or corrosion, and after the transmission has overheated. A properly functioning oil cooling system has a direct impact on the durability of the automatic transmission and the comfort of gear shifting.
If you are planning a comprehensive repair or upgrade of the oil cooling area in your Audi and need other components from the same group, such as oil lines, oil coolers, or additional return lines, check the available parts in the Audi oil coolers and pipes category.
To better understand the impact of an efficient cooling system on the durability of the powertrain and accessories, it is worth reading the service guide on overheating and diagnostics, available in the article Engine cooling system – overheating, repair, and used radiators.






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