The 1991 Audi A6, built on the C4 platform, represents a refined executive sedan and wagon known for its understated luxury, robust engineering, and the exceptional traction provided by its available Quattro all-wheel-drive system. This model, a successor to the Audi 100, continued Audi's legacy of innovation, offering a comfortable and capable touring experience that competed with established luxury marques. Available with a range of sophisticated inline-5 and V6 engines, the A6 was designed with a focus on quality and performance, making it a distinguished choice in its segment.

This comprehensive Service and Repair Manual is designed to provide dealer-level technical information for all models and trims of the 1991 Audi A6. It covers a complete A-Z repair scope, detailing everything from routine scheduled maintenance and fluid services to in-depth diagnostics and complete overhauls of all major systems, including the engine, transmission, brakes, suspension, and electrical systems. This manual serves as an indispensable resource for owners, mechanics, and technicians, offering step-by-step procedures, diagnostic guides, and essential technical specifications to ensure the proper maintenance and repair of the vehicle.