2009 Audi Q7 3.0 TDI First Impressions
German luxury automaker Audi has been mastering diesel technology for quite a long time. In fact, the four-ring brand has sold TDI models for the last 40 years or so, albeit essentially in Europe. In recent years, Audi wrote its name in the history books by winning the 24 Hours of Mans with a diesel-powered supercar.