The 2019 Audi A6 40 TDI S Line is a standout executive saloon known for its blend of high end technology, efficient clean diesel performance, and sharp S Line styling. The 40 TDI 2.0 litre diesel engine delivers plenty of torque, offering a significant power boost over previous generations while remaining exceptionally quiet. The 7-speed S tronic dual-clutch transmission provides slick gear changes and is particularly strong for mid-range overtaking. The S Line trim adds more aggressive body styling, including side skirts, a unique front grille, and larger wheels.