2011 Audi A6 S-Line Special Edition - 3.0 TDI Quattro Automatic Selling my Audi A6 Saloon. This is the highly desirable S-Line Special Edition model, combining luxury, look, and performance with Audi's famous Quattro all-wheel-drive system. Key Features & Spec: Engine: 3.0L TDI Diesel (Powerful yet great on fuel for its size) Gearbox: Smooth Automatic Audio: Premium factory-fitted Bose Sound System Interior: Full black leather S-Line embossed seats Exterior: Metallic Black with S-Line styling and alloy wheels