Audi was restructuring their model lineup in early and mid-1990s, and in late 1994, began selling the fifth generation (C4) Audi 100 model, re-badged as the Audi A6. Wanting to keep a sports-saloon in their lineup, the company made small revisions to what was previously known as the Audi S4, renaming it the Audi S6; the S4 name would eventually be re-used for a completely different model derived from Audi's smaller based Audi A4. As this was the first S6 model from Audi, it is commonly referred to as the Ur-S6, derived from the German, "Ursprünglich" (meaning: original).
It was available as both a saloon/sedan and an "Avant" estate/wagon. Audi's trademark "procon-ten" safety system was standard fitment.
From its launch in late 1994, the Audi S6 was powered by a 2,226 cubic centimetres (135.8 cu in) turbocharged inline five-cylinder petrol engine with a Bosch Motronic electronic engine control unit (ECU), producing a motive power output of 169 kilowatts (230 PS; 227 bhp) at 5,900 revolutions per minute (rpm), and 326 newton metres (240 ft·lbf) at around 1,950 rpm, whilst consuming high octane "Super Plus" 98RON unleaded petrol. This powerful engine gave the S6 good performance with a top speed of 235 kilometres per hour (146.0 mph), and 0 to 100 km/h (62.1 mph) in 6.7 seconds; with 160 km/h (99.4 mph) being reached in 17.5 seconds.
Source: Wikipedia, 2011