No matter which engine you choose, you’ll find generous power at the ready. We selected the standard 3.0-liter supercharged V6 engine, as it's more than capable to move this large sedan with authority. The twin-turbocharged V8 is certainly enticing, but most people may find it superfluous and costly.
In any event, the standard engine makes 333 horsepower and 325 pound-feet of torque, good enough to move this lightweight sedan from zero to 60 mph in just 5.5 seconds. The eight-speed automatic transmission does its best to keep up with this engine, working nearly seamlessly in the background. We found the A8 light and agile.
Working in this sedan’s favor is the brand’s laudable all-wheel-drive system, dubbed Quattro. It splits power at a 40/60 ratio front to back, but it can also send up to 60 percent of its power to the front axle, when needed. If driving dynamics are important to you, an available Sport Package adds a rear sport differential, a variable ratio steering rack, an air suspension, and summer tires.
All models have Drive Select, an electronically controlled system that oversees engine and transmission responses, suspension feel, and steering weight. Choose between Comfort, Auto, and Dynamic modes to find the level of driving engagement that suits you best. Select the driving engagement you want, but you should know that the electric power steering rack tempers driving enjoyment somewhat.