Standard power is Audi’s 4. V8, now rated 372 horsepower, up 22, with 328 pound-feet of torque, up three. A revised 4. V8 powers the 2007 Audi A8. Utilizing direct fuel injection, it makes 350 horsepower. Last year’s engine made 335 hp.In front-drive A8s, it displaces 3. All-wheel-drive Quattro models, like our test car, pack a larger 4. While both engines feed power through a standard 5-speed automatic transmission.As a whole, consumers found the vehicle’s styling and comfort to be its strongest features and reliability to be its weakest. A8 five out of five stars. Overall, consumers seem aligned in their opinions of the 2004 audi a8. Frequently asked questions: most reliable audi a8 years a: if you’re looking for the most dependable audi a8 model years, consider the 2000, 2001, 2006, 2007, 2008, 2009, 2010, 2020, 2021, 2022, and 2023 versions. These years have fewer customer complaints and offer the best value to owners.A: Yes, the Audi A8 is costly to maintain due to its luxury, advanced technology, and the need for premium parts and specialized labor. However, if it is under warranty, it makes it a lot easier on your pocket.The bulletproof Audi A8 sedan is an outstanding selection for dignitaries, high-profile individuals, security personnel, and other individuals who expect top-tier safety without sacrificing elegance and comfort.