Which used Audi Q7 4x4 should I buy?
Both versions of the standard 3.0 TDI engines are relatively smooth and powerful, yet manage reasonable official fuel economy. Our pick is the higher-powered of the two engine options, the 272, because it offers great performance whether you’re in town or on the motorway. It’s incredibly smooth and quiet, even when pushed hard, and it isn’t much pricier to buy and run than the lesser TDI 218. The same holds true of the later versions, from among which we'd pick the 50 TDI quattro.