Audi A8 D4 Exhaust Manifold Right O/S 4.2TDI Diesel Engine 057253034BJ

Audi A8 D4 Exhaust Manifold Right O/S 4.2TDI Diesel Engine is an original exhaust system component designed for the 4.2 TDI diesel units in the luxury Audi A8 D4 generation sedan. This used manifold from this series ensures factory-standard exhaust channel geometry, which promotes stable engine operation, proper exhaust gas discharge, and the maintenance of appropriate thermal parameters. It is a solution for users who expect a technically matched component while maintaining reasonable repair costs.

Specifications and technical data

• SKU: 057253034BJ
• Mark: Audi
• Condition: Used
• OEM Part Number: 057253034BJ
• Substitutable numbers: 057253034BJ, 057 253 034 BJ
• Location on the vehicle: Right
• Fuel type: Diesel
• Category: Manifolds & Headers

Purpose and compatibility with the 4.2 TDI unit

The presented right exhaust manifold has been designed specifically for the 4.2 TDI diesel engine in the Audi A8 D4 model. The construction, adapted to the V8 layout, guarantees proper alignment with the cylinder head, turbocharger, and other exhaust system components. As a result, proper connection tightness, adequate exhaust flow, and stable operating conditions for the power unit are maintained across the full load range.

The placement on the right side of the vehicle means that the manifold works with a specific bank of cylinders, which is important when planning repairs or replacing only one side of the system. Choosing an original component from this series limits the risk of assembly issues, collisions with engine accessories, or the need for additional modifications.

Technical characteristics and role in the exhaust system

The exhaust manifold in the 4.2 TDI diesel engine is responsible for collecting exhaust gases from individual cylinders and directing them to the subsequent parts of the system. Properly designed channels influence:

• maintaining appropriate exhaust pressure before the turbocharger,
• stable operating temperature of the cylinder head and exhaust valves,
• reducing flow losses and improving engine response to load,
• reducing the risk of localized thermal stress.

For diesel units, resistance to high temperatures and pulsating loads is particularly important, which is why using an original manifold from the Audi A8 D4 series is beneficial both in terms of durability and the repeatability of operating parameters.

Condition, functionality, and service application

The item comes from the Exhaust Manifolds category and is a used part, which allows for economical repair while maintaining the factory design. This type of component is particularly useful in situations where the existing manifold has cracked, suffered thermal deformation, or shows leaks resulting in power loss, louder engine operation, or diagnostic errors.

Choosing a used Audi manifold for the 4.2 TDI diesel unit is a solution often used in professional workshops when the priority is maintaining the original geometry of the exhaust system while simultaneously reducing costs compared to a new part. The product will work well both for standard replacement and for larger overhaul work in the engine area.

Assembly and operational recommendations

When installing the right exhaust manifold in an Audi A8 D4 4.2 TDI, it is recommended to pay attention to:

• checking the mating surface to the cylinder head and using appropriate seals,
• proper tightening of fasteners in accordance with service procedures,
• checking the condition of adjacent exhaust system elements and engine accessories,
• verifying tightness after the power unit has warmed up for the first time.

This approach helps reduce the risk of repeated disassembly and ensures stable system operation in the long term. A used manifold can also be a good starting point for further exhaust system modifications if changes towards a more dynamic engine character are planned.

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 manifolds, downpipes, or connection elements, check the available parts in the Audi Exhaust Manifolds category.

More about used exhaust manifolds

When selecting a used manifold for a diesel engine, it is worth knowing the typical signs of wear, methods for verifying tightness, and the differences between stock and more performance-oriented solutions. If you want to better understand how the exhaust system affects the performance and durability of the power unit and how to consciously choose used components, read the article Performance exhaust system: used manifolds and sports catalytic converters on the road.