It's easy to forget how good the Audi A4 has been and for how long. The most recent generation has been around since 2009, and that does perhaps make the car's exterior styling seem a bit familiar. Then there's all-wheel drive, once an Audi specialty but now very common among luxury sedans. Yet when you really get down to it, the 2015 Audi A4 still has an impressively well-balanced portfolio of attributes. Learn more about the 2015 Audi A4 Premium S-LINE QUATTRO.