Audi RS4 B8 RS5 8T 4.2 FSI Quattro Bare Engine CFSA 450HP with 63k, WARRANTY

Warranty and technical condition of the part

The engine is sold with a 90-day warranty.

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

Listing details

The offer applies to a bare engine.

The engine is sold without accessories (e.g. alternator, starter motor, manifolds, injectors, turbocharger, etc.).

Audi RS4 B8 RS5 8T 4.2 FSI Quattro Bare Engine CFSA 450HP with 63k, WARRANTY is a proposal for demanding users looking for a factory, high-revving V8 petrol engine for use in Audi sports models. This bare engine from the Audi Engines family provides a solid foundation for professional repair, rebuilding, or performance projects, while maintaining the original characteristics of the CFSA unit.

Specifications and technical data

• SKU: 079100033D
• Mark: Audi
• Condition: Used
• OEM Part Number: 079100033D
• Substitutable numbers: 079100033D, 079 100 033 D
• Fuel type: Petrol
• Number of cylinders: 8
• Category: Engines
• Engine code: CFSA
• Mileage: 63 000

Technical characteristics of the CFSA unit

The engine belongs to the family of naturally aspirated V8 petrol units, designed to work with the quattro drive system and sports transmissions. The use of petrol fuel, combined with the advanced design of the cylinder heads and fuel system, allows for high power output with linear torque delivery, which is particularly valued in the RS4 B8 and RS5 8T models.

The 8-cylinder configuration ensures characteristic refinement and quick throttle response, and the CFSA engine code uniquely identifies this design version in Audi service catalogs. A bare engine means that this is the core of the power unit – the block with the crankshaft and piston assembly and basic housing – ideal for further completion according to the requirements of a specific project.

Application in Audi RS4 B8 and RS5 8T

The presented engine is designed for Audi sports models with quattro drive, where thermal stability, load resistance, and repeatability of parameters during dynamic driving are key. The CFSA unit is used in the B8 generation RS4 and the 8T RS5, which facilitates the selection of accessories, control systems, and accompanying components according to the manufacturer's documentation.

As a bare engine, it will work well both for a standard replacement of a damaged unit and for building a track car or a track day project, where the ability to individually configure accessories, the intake system, the exhaust system, and cooling is what counts.

Condition, mileage, and operational potential

The unit is offered as a used engine, which allows for a significant reduction in repair costs compared to a new complete engine, while maintaining the original manufacturer's specifications. The declared mileage ensures significant remaining operational potential, especially with proper installation, appropriate oil service, and inspection of accessories before the first start in the new vehicle.

Choosing a used CFSA engine is beneficial both economically and technically – it allows for maintaining the factory operating parameters of the 4.2 FSI unit without the need for modifications to the installation, mounts, or drivetrain in the base vehicle.

Benefits of choosing an original Audi engine

The original engine from the Engines category ensures full compatibility with factory mounting points, lubrication, and cooling systems, which facilitates installation and reduces the risk of operational issues. Maintaining the CFSA code means compatibility with the factory engine control unit, wiring harness, and software used in the RS4 B8 and RS5 8T.

For workshops specializing in the Audi brand and for private users, this means a predictable installation process, easier diagnostics, and access to service documentation and adjustment data prepared specifically for this power unit.

Selection, installation, and expert knowledge

Before purchasing, it is worth verifying the engine code compatibility with the vehicle documentation and planning the scope of accompanying work – replacing seals, checking the timing system, and cleaning the oil and cooling systems. Procedures for selection by VIN and OEM, described in more detail in the article: Why it is worth buying used gearboxes and engines – facts instead of myths, where practical aspects of purchasing and installing used power units are discussed, may be helpful.

Additionally, when making a decision between a used original part and a replacement, it is worth reading the guide 5 reasons why a used OEM part is a better choice than a replacement, which simply explains the differences in fitment, durability, and total repair cost.

If you are planning a comprehensive repair or upgrade of the engine area in your Audi and need other components from the same group, such as blocks, heads, or bare engines, check the available parts in the Audi Engines category.