The A8’s blend of performance, comfort and serenity are wedded to a beautifully built, practical and well-equipped interior. In fact, by a whisker, it beats the Mercedes S Class, which shows just how good to drive and be driven the Audi A8 is .Opting for S line trim gets you larger 18in wheels, Matrix LED headlights with LED rear lights, front sports seats and rear privacy glass. This 3.0-litre V6 diesel is smooth and quiet, if not quite as refined as the 400d engine in the rival Mercedes S Class. It is a powerful engine and  performance is more than adequate and there’s a healthy swell of acceleration available from low revs.