Introduced during the 2004 model year on a completely refreshed vehicle platform, the Audi A8 L was an extended wheelbase version of the A8 sedan. Compared to the 2005 model year standard wheelbase A8, the 2005 Audi A8 L was 5.1 inches longer in overall length that is biased towards rear seat room. Entering the market powered by a 4.2-liter V-8 engine paired with a six-speed automatic transmission and quattro all-wheel drive in 2004, the 2005 model of the Audi A8 L additionally offered a 450-horsepower W-12 engine.
The leather-upholstered interior of the 2005 Audi A8 L featured an array of 10 airbags. The exterior design of the 2011 Audi A8 L received a revision featuring redesigned headlight housings and is equipped with an eight-speed automatic transmission. A 372-horsepower version of the 4.2-liter V-8 engine remained part of the 2011 Audi A8 while an upgraded W-12 powerplant generating 500 horsepower was added for 2012. For specialized exclusive car activity, the 2011 model year also provided a factory available A8 L Security model fitted with armor-grade construction, two-way communication system and a fire extinguishing system.
In 2013, the 4.2-liter V-8 was replaced by a supercharged 3.0-liter V-6 and a twin-turbocharged 4.0-liter V-8 engine. A fourth engine was made available on the 2014 model year Audi A8 L with the addition of a 3.0-liter TDI powerplant.