The 6.0-liter W12 engine in the Audi A8 D3 Quattro produces 420 horsepower at 5,500 rpm and 315 lb-ft of torque at 4,000 rpm.
The 6.0-liter W12 engine features a twin-scroll turbocharger, direct fuel injection, and variable valve timing.
The Audi A8 D3 Quattro has an all-wheel-drive system with a transfer case that can send up to 85% of the power to the rear wheels.
The car's differential is equipped with a viscous coupling unit.
The Audi A8 D3 was available in several trim levels, including the Base model, Luxury model, and the high-end Prestige model.
In its first year, the 2003 Audi A8 D3 Quattro had an MSRP of $72,500 in the United States.
The car's 6-speed automatic transmission was sourced from ZF.
The brake system features 13-inch ventilated discs in front and 12.2-inch solid discs at the rear.
The Audi A8 D3 has a ground clearance of 6.7 inches (170 mm).
The car's weight distribution is 55% over the front axle and 45% over the rear axle.
The Audi A8 D3 Quattro features a panoramic sunroof with an area of approximately 4.1 square feet (0.38 square meters).
The car has a turning radius of 36.7 feet (11.2 meters) when equipped with the standard wheels.
The 6.0-liter W12 engine's fuel tank capacity is 23.65 gallons (89 liters).
The Audi A8 D3 Quattro features an adaptive bi-xenon headlight system.
The car has a drag coefficient of 0.31.
In the United States, the 2003 Audi A8 D3 Quattro achieved a 14 mpg city and 20 mpg highway fuel economy rating from the Environmental Protection Agency (EPA).
The car's interior features include a power tilt/telescoping steering column with memory, eight-way adjustable front seats, and a six-disc CD changer.
The Audi A8 D3 Quattro has a cargo capacity of approximately 14.6 cubic feet (414 liters) behind the rear seats.
The car's optional driver information system features a seven-inch display screen.
In Europe, the Audi A8 D3 was sold as the S8 for high-performance trim levels.
The car's base price in 2004 for the European market was €85,000 (approximately $95,500 USD).
The 6.0-liter W12 engine has a specific fuel consumption of approximately 1.5 pounds per mile (2.43 liters per kilometer) at average driving conditions.
Audi's Quattro system in the A8 D3 Quattro allows the driver to switch between different drive modes, including Auto, Sport, and Comfort settings.
The car features an optional adaptive cruise control with a radar sensor.
In the 2003 model year, the Audi A8 D3 Quattro was also available as a sedan body style with an additional $2,000 (approximately €1,700) premium in some markets.
The car's exterior paint options included Pearl Metallic colors such as Glacier White and Phantom Black, among others.
Audi offered an optional rear-seat entertainment system with two 8-inch screens for the A8 D3 Quattro.
The car's interior trim options featured wood grain or aluminum inlays on some models.
In 2005, a facelifted version of the Audi A8 D3 was released, featuring revised front and rear styling.
The updated model also introduced new optional equipment such as LED ambient lighting.
The car's fuel tank capacity remained unchanged at 23.65 gallons (89 liters) for the updated model year.