The Audi A6 S line is the mid-range point in the model's line-up, adding an element of sportiness to the executive saloon's range. The A6 competes against the likes of the BMW 5 Series Specs & Features Used 2004 Audi A6 2.7T S-Line quattro - Specs & Features Buy In-Store Buy In-Store Buy Online Overview 5-speed shiftable automatic All wheel drive Cylinders Total Seating 05ee.