In comparison to the base A6, the S-Line Premium model looks a bit more aggressive. Special exterior trim and an upgraded set of wheels transform it into a stunning sports sedan. Under the hood sits a turbocharged four-cylinder engine. Aside from the engine’s punchy performance, it also delivers superb fuel efficiency. Opt for the AWD package if you plan to encounter snowy weather. Some of the standard goodies include Audi’s MMI infotainment system, leather upholstery, and satellite radio. A five-star safety rating pushes the A6 S-Line Premium further past its key rivals.