The Audi A6 is a mid-size executive car produced by the German automaker Audi. It is available in saloon and station wagon (Avant) body styles. The second generation A6 was also used as the basis for the allroad quattro. Its primary competitors are the Mercedes-Benz E-Class, BMW 5-Series, Saab 9-5, Alfa Romeo 166, Jaguar S-Type, Lexus GS and Volvo S80.
The exterior was changed only a bit from the C4 100 - new front and back lights, new radiator grid, the same happening with chassis and engine and transmission choices. The new engines for the A6 were 1.8 20V, 2.8 30V, 1.9 TDI, and the 2.5 R5 TDI (140 PS), with the 2.3 engine being dropped on most markets. The S6's 4.2 V8 was uprated to 290 PS (286 hp/213 kW) and a new 326 PS (322 hp/240 kW) version was added (S6+ made by quattro GmbH). Up until 1997, the A6 came with several different engines, two of them turbo-diesel, and most of them available with Audi's quattro all wheel drive system. The A6 was also available with sedan and Avant bodies.Source: Wikipedia.