In Germany, the Mazda 6 has stiff competition. The Audi A4 and the BMW 3 series are popular, especially in company vehicle fleets, which account for a large share of sales. We tested the Japanese car in the station wagon version, which is selling well with private customers.Our test car features the series’ most powerful engine, a 129-kilowatt diesel, in all-wheel drive. And design isn't the only thing drawing attention to the Mazda 6. Its selection of assistant systems and its comfort make it well worth a look.