Audi RS4 B7 8E Complete Engine BNS 4.2 FSI 420HP Petrol 99k miles, WARRANTY

Warranty and technical condition of the part

The engine is sold with a 90-day warranty.

The warranty covers the engine itself; engine accessories are covered by a 30-day warranty.

The power unit was tested before removal and is in full working order.

Listing details

The offer applies to a complete engine.

The engine comes from a right-hand drive (RHD) vehicle. The wiring harness is not compatible with left-hand drive (LHD) vehicles and requires replacement or modification.

Audi RS4 B7 8E Complete Engine BNS 4.2 FSI 420HP Petrol 99k miles, WARRANTY is an advanced V8 powertrain unit designed for vehicles with a distinctly sporty character. The complete petrol engine with the BNS code ensures dynamic acceleration, high refinement, and the characteristic V8 sound valued by Audi brand enthusiasts. This is a solution for users looking for a technically matched engine for professional repair or powertrain restoration.

Specifications and technical data

• SKU: 079100031K-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 079100031K
• Substitutable numbers: 079100031K, 079 100 031 K, 079100031KX, 079 100 031 KX
• Fuel type: Petrol
• Number of cylinders: 8
• Part type: Complete Assembly
• Category: Engines
• Engine code: BNS
• Mileage: 99 000

Technical characteristics of the BNS 4.2 FSI unit

The engine belongs to the Engines category and represents a V8 construction powered by petrol using FSI technology. The use of eight cylinders translates into smooth power delivery, stable operation across the entire rev range, and a high torque reserve, which is particularly important in RS-class cars.

The BNS family unit was designed for intensive use in both road and track conditions, ensuring quick throttle response, precise rev building, and predictable behavior under high load. The design based on direct petrol injection promotes efficient fuel utilization and stable operation at high RPM ranges.

Application in the Audi RS4 B7 8E

The presented complete engine is intended for Audi RS4 B7 8E generation models, where it plays a key role in building the vehicle's sporty character. The BNS 4.2 FSI 420HP unit was factory-tuned for dynamic driving, offering quick revving and a distinct, linear power characteristic.

An engine of this type is chosen both for standard replacement of a worn-out unit and for comprehensive car restoration to a specification close to factory standards. By maintaining the original design concept, it is possible to keep the proper balance between performance, durability, and driving comfort.

Condition, mileage, and selection by VIN/OEM

The unit is offered as a used complete engine, which allows for a significant reduction in repair costs compared to purchasing a new component, while maintaining the manufacturer's original specification. The declared mileage allows for a realistic assessment of the wear level and is an important reference point when planning further service after installation.

When selecting an engine for a specific Audi RS4 B7 8E, it is crucial to verify compatibility using the VIN and OEM numbers. This helps avoid problems with the compatibility of accessories, wiring harnesses, and control units, and ensures proper cooperation with the vehicle's existing installation.

To better understand the selection process and the benefits of purchasing a used powertrain unit, it is worth reading our expert guide: Why it is worth buying used gearboxes and engines – facts instead of myths. The article discusses, among other things, VIN/OEM matching procedures and cost ratios compared to new parts.

Benefits of choosing a used Audi engine

Choosing a complete engine from dismantling for the Audi RS4 B7 8E is a solution that combines economic aspects with the preservation of the car's original character. The main advantages of this solution include:

• the possibility of restoring full powertrain efficiency at a lower investment cost,
• preservation of the factory BNS 4.2 FSI 420HP unit concept,
• reduction of vehicle downtime thanks to the installation of a complete engine instead of part-by-part repair,
• easier diagnostics and service due to compliance with factory Audi solutions.

Additionally, proper maintenance after installation – regular oil changes, cooling and fuel system checks – allows for significantly extending the unit's lifespan. Practical tips in this regard can be found in the guide: How to extend the life of used car parts?, which describes, among other things, recommendations regarding the operation of engines from dismantling.

Audi engines – selecting elements from the same group

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 blocks, cylinder heads, or complete powertrain units, check the available parts in the Audi Engines category.

Summary

Audi RS4 B7 8E Complete Engine BNS 4.2 FSI 420HP Petrol 99k miles, WARRANTY is a proposal for users expecting sporty performance, compliance with factory specifications, and reasonable repair costs. The used V8 unit with direct petrol injection allows for restoring full powertrain functionality while maintaining the characteristic features of the RS4 B7 model. A properly selected and correctly serviced engine provides a solid foundation for further, conscious vehicle operation in demanding road conditions.