For its final outing in B9 form, the S4 had both turbocharged petrol V6 and yes, diesel engines. Combined with an eight-speed automatic transmission and the ubiquitous quattro all-wheel drive ...

The Audi S4 (B9) delivers serious performance, luxury, and everyday usability—but is it so good that you don’t even need an RS4? Join me for my first drive as I put this sports sedan to the test!