AUDI S5 8T Petrol 4.2 FSI V8 Coolant Hose Rear Engine Water Pipe 079121071CF

AUDI S5 8T Petrol 4.2 FSI V8 Coolant Hose Rear Engine Water Pipe is an original cooling system component from the Cooling system hoses and pipes group, designed for operation in the demanding environment of a V8 petrol engine. Engineered for a specific powertrain configuration, it ensures stable coolant flow in the rear section of the engine and supports the maintenance of proper operating temperatures.

Specifications and technical data

• SKU: 079121071CF-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 079121071CF
• Substitutable numbers: 079121071CF, 079 121 071 CF
• Location on the vehicle: Rear
• Fuel type: Petrol
• Category: Coolant Hoses

Purpose and function in the cooling system

The described water pipe operates in the rear zone of the powertrain, where high temperatures and significant thermal loads are concentrated. Its task is to reliably guide coolant between system components, ensuring the 4.2 FSI V8 engine maintains stable operating conditions across the entire rev range. Precise geometry matching for the specific Audi model reduces the risk of stress, leaks, and improper flow.

Construction and fitment for Audi S5 8T

The pipe belongs to a group of components that must be perfectly matched with the engine block, accessories, and other cooling lines. Properly selected connection diameters, shape, and mounting points allow for stable installation without the need for modifications. This preserves the factory coolant flow path, which facilitates system bleeding and reduces localized overheating.

The component is prepared for use with a petrol engine, where the cooling system must react to rapid changes in load and temperature. The correct positioning of the pipe in the rear part of the engine promotes even coolant distribution and improves the operating conditions of the entire system.

Benefits of using an original water pipe

Using an original line from the Cooling system hoses and pipes group in an Audi allows you to maintain the flow parameters specified by the vehicle manufacturer. This is particularly important in high-performance engines, where improper component selection can lead to overheating, performance loss, or accelerated wear of sub-assemblies. The appropriate rigidity and shape of the pipe facilitate installation and subsequent maintenance.

A used original component is a solution that allows you to balance cost control with the preservation of the factory cooling system characteristics. For many Audi S5 8T users, this is a reasonable compromise between quality and budget, especially for repairs performed in specialized workshops.

Role in V8 petrol engine operation

A large-displacement V8 petrol engine generates significant amounts of heat, which is why an efficient cooling system is crucial for its durability. The rear water pipe is responsible for maintaining the continuity of coolant circulation in areas that are harder to access and more prone to thermal stress. The proper condition of this component reduces the risk of leaks, coolant level drops, and sudden temperature spikes during dynamic driving.

To better understand the impact of ambient temperature on cooling system operation and the importance of efficient components, it is worth checking out a guide describing operation in high temperatures – details can be found in the article Summer heat vs. cooling system: used radiators and fans as a guarantee of savings.

Audi cooling system hoses and pipes – expansion and service

If you are planning a comprehensive repair or upgrade of the engine area in your Audi and need other elements from the same group, such as additional lines, connectors, or flexible cooling hoses, check out the available parts in the Audi cooling system hoses and pipes category.

Why choose used originals for premium cars

In the premium car segment, used original components that retain factory parameters while allowing for reduced repair costs are increasingly being chosen. This trend also applies to cooling systems in models such as the Audi S5 8T. If you want to learn more about the broader market context and why used OEM components are becoming a popular choice, take a look at the article Crisis in the new parts market? Why used originals for premium cars are the hottest trend in 2026.