Audi R8 4.2 V8 Petrol Engine Coolant Oil Tank Reservoir Storage 420115373B

Audi R8 4.2 V8 Petrol Engine Coolant Oil Tank Reservoir Storage is an original cooling system component designed for petrol engines, ensuring stable engine operating conditions even during dynamic driving. Thanks to the factory Audi design, this used sub-assembly guarantees proper circulation and storage of the oil cooling medium, which translates into protecting the engine from overheating. It is a practical solution for users who want to maintain the integrity of the lubrication and cooling system in their R8 without compromising on fitment.

Specifications and technical data

• SKU: 420115373B
• Mark: Audi
• Condition: Used
• OEM Part Number: 420115373B
• Substitutable numbers: 420115373B, 420 115 373 B
• Fuel type: Petrol
• Part type: Oil Cooler
• Category: Engine Oil Coolers & Lines

Purpose and role in the oil cooling system

The described reservoir is a component of the system responsible for storing and stabilizing the coolant that works with the oil circuit in the V8 petrol engine. In combination with the oil cooler and lines, it creates a coherent system designed to:

• maintain the correct amount of cooling medium in the oil circuit,
• compensate for changes in fluid volume resulting from operating temperatures,
• assist in heat dissipation from the engine lubrication area,
• ensure stable thermal conditions under high loads.

As a result, the engine maintains proper operating parameters, and the oil retains its lubricating properties across a wider temperature range.

Benefits of using an original Audi reservoir

Using an original oil coolant reservoir in an Audi R8 4.2 V8 provides a number of practical operational benefits:

• Factory fitment – the design complies with the vehicle manufacturer's specifications, facilitating installation and integration with the existing oil cooling system.
• Consistency with other system components – the reservoir works with the oil cooler and lines according to Audi engineers' specifications.
• Reduced risk of leaks – proper fitting of ports and connections minimizes the risk of coolant leaks.
• Stable operating conditions for the petrol engine – maintaining the correct oil temperature supports the durability of the power unit.

This solution is particularly beneficial during intensive use, where the oil cooling system has a direct impact on the thermal safety of the engine.

Performance characteristics and installation

As an element from the Oil coolers and lines group, the reservoir works with the rest of the installation in the engine bay, responsible for the proper flow and reserve of the oil coolant. The used component allows for an economical repair or restoration of the factory configuration without the need to resort to replacements with uncertain fitment.

Before installation, a standard service procedure is recommended, including checking the system for leaks, inspecting the condition of the lines, and bleeding the system after filling with fluid. A correctly installed reservoir supports uniform heat distribution within the lubrication system, which is essential for the durability of a high-power petrol engine.

Technical support and part selection

The item has an assigned OEM part number and interchangeable numbers, which facilitates precise identification and selection for a specific Audi R8 configuration. In case of any doubts regarding fitment, it is worth using the manufacturer's markings or consulting the technical department to ensure compatibility with a given version of the power unit.

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 oil coolers, oil lines, or additional fluid reservoirs, check the available parts in the Audi oil coolers and lines category.

More about cooling system operation

When operating a high-power petrol engine, it is crucial to understand how the cooling system – including the circuit working with the oil – reacts to loads and ambient temperature. In the summer, it is particularly important to monitor fluid levels and the condition of components such as reservoirs, radiators, and fans.

To better plan service and consciously use used cooling system components, it is worth reading the guide: Summer heat vs. cooling system: used radiators and fans as a guarantee of savings. This will make it easier for you to assess when replacing the oil coolant reservoir is justified and how to combine it with other service work.