The A8 represents Audi's answer to the Mercedes S-Class and BMW 7-Series. The first A8 was introduced in 1994, and a second-generation version came ten years later in 2004. Most recently, the A8 received a modest update for the 2008 model year.

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Based on the D3 platform, the current A8 is the first Audi to make use of the so-called single-frame grille from the Nuvolari concept car. It uses a unique all-aluminum body for decreased weight.

A 4.2 liter V8 is the only engine offered with the flagship model in the U.S. market. It produces 350 horsepower at 6,800 rpm and 325 pound-feet of torque at 3,500 rpm, taking the flagship sedan to an electronically top speed of 130mph and . The performance oriented S8 and long-wheelbase A8 L both have more powerful engines.

For the 2008 model year, Audi claims it has introduced an "even more precise driving feel, superior ride and acoustic comfort and subtle refinements to the design and interior underline the exceptional position of the sportiest saloon in the luxury class."

The rack-and-pinion steering has been optimized and is now more direct than the previous model. The air-bag suspension has also been modified for better handling while also improving ride comfort. New light-weight sound-deadening materials are also used, resulting in exceptional ambient noise levels without increasing weight.

Exterior changes include new exterior mirrors, new wheel designs and new-look LED taillights.

The A8 comes standard with a six-speed Tiptronic automatic and the fourth generation of Audi's Quattro all-wheel drive system. Inside, a five-channel surround sound system with five speakers and tuning by Bose, a navigation system and Bluetooth connectivity is standard, along with Dual zone climate control.

A choice of three opulent interiors costs $11,500 each, with a 14-speaker, near 1,100 watt $6,300 Bang & Olufsen sound system as the second most costly option. A Sport package will set buyers back $4,000 and get them multi-spoke 20-inch wheels shod with summer only performance tires, a more aggressive tune for the air suspension and a three-spoke leather steering wheel with paddle shifters.