The Audi A8 L (D4, 4H) 4.0 BiTFSI V8 quattro Tiptronic represents the pinnacle of performance and luxury within the fourth generation (D4) of Audi’s flagship sedan. Produced from May 2012 to 2013, this variant was positioned as the high-performance, long-wheelbase option, catering to buyers seeking both exhilarating power and refined comfort. It sits atop the A8 range, offering a significant step up in performance compared to the 3.0-liter supercharged V6 and the 4.2-liter naturally aspirated V8 models. The “L” designation signifies the extended wheelbase, providing increased rear passenger legroom, a key feature for the A8’s target demographic.
Technical Specifications
| Brand | Audi |
| Model | A8 |
| Generation | A8L (D4, 4H) |
| Type (Engine) | 4.0 BiTFSI V8 (420 Hp) quattro Tiptronic |
| Start of production | May, 2012 |
| End of production | 2013 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (economy) – urban | 13.1 l/100 km (18 US mpg, 21.6 UK mpg, 7.6 km/l) |
| Fuel consumption (economy) – extra urban | 7.4 l/100 km (31.8 US mpg, 38.2 UK mpg, 13.5 km/l) |
| Fuel consumption (economy) – combined | 9.5 l/100 km (24.8 US mpg, 29.7 UK mpg, 10.5 km/l) |
| CO2 emissions | 221 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 4.7 sec |
| Acceleration 0 – 62 mph | 4.7 sec |
| Acceleration 0 – 60 mph | 4.5 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 4.6 kg/Hp, 215.9 Hp/tonne |
| Weight-to-torque ratio | 3.2 kg/Nm, 308.5 Nm/tonne |
| Power | 420 Hp @ 5500 rpm |
| Power per litre | 105.2 Hp/l |
| Torque | 600 Nm @ 1500-4500 rpm (442.54 lb.-ft. @ 1500-4500 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | CEUA |
| Engine displacement | 3993 cm3 (243.67 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 84.5 mm (3.33 in.) |
| Piston Stroke | 89 mm (3.5 in.) |
| Compression ratio | 10.1:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | BiTurbo, Intercooler |
| Engine oil capacity | 8.7 l (9.19 US qt | 7.65 UK qt) |
| Coolant | 15 l (15.85 US qt | 13.2 UK qt) |
| Kerb Weight | 1945 kg (4287.99 lbs.) |
| Max. weight | 2595 kg (5721 lbs.) |
| Max load | 650 kg (1433 lbs.) |
| Trunk (boot) space – minimum | 510 l (18.01 cu. ft.) |
| Trunk (boot) space – maximum | 906 l (32 cu. ft.) |
| Fuel tank capacity | 90 l (23.78 US gal | 19.8 UK gal) |
| Max. roof load | 100 kg (220.46 lbs.) |
| Permitted trailer load with brakes (8%) | 2300 kg (5070.63 lbs.) |
| Permitted trailer load with brakes (12%) | 2300 kg (5070.63 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 95 kg (209.44 lbs.) |
| Length | 5267 mm (207.36 in.) |
| Width | 1949 mm (76.73 in.) |
| Width including mirrors | 2111 mm (83.11 in.) |
| Height | 1471 mm (57.91 in.) |
| Wheelbase | 3122 mm (122.91 in.) |
| Front track | 1644 mm (64.72 in.) |
| Rear (Back) track | 1635 mm (64.37 in.) |
| Front overhang | 1003 mm (39.49 in.) |
| Rear overhang | 1142 mm (44.96 in.) |
| Drag coefficient (Cd) | 0.27 |
| Minimum turning circle (turning diameter) | 12.7 m (41.67 ft.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 8 gears, automatic transmission Tiptronic |
| Front suspension | Independent multi-link suspension |
| Rear suspension | Independent on trapezoidal lever |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 235/55 R18 |
| Wheel rims size | 8.0J x 18 |
Powertrain & Engine Architecture
The heart of the A8 L 4.0 BiTFSI is the CEUA engine, a 4.0-liter twin-turbocharged V8 gasoline engine. This engine utilizes direct fuel injection (FSI) and Audi’s Valvelift system, which allows for variable valve lift on both the intake and exhaust sides, optimizing performance and efficiency. The twin-turbochargers, positioned within the V of the engine, provide minimal turbo lag and a broad torque curve. The engine produces 420 horsepower at 5500 rpm and a substantial 600 Nm (442.54 lb-ft) of torque available from a low 1500 rpm all the way to 4500 rpm. This power is channeled through an eight-speed Tiptronic automatic transmission, which offers both fully automatic operation and manual gear selection via steering wheel-mounted paddles. The quattro all-wheel-drive system distributes power between the front and rear axles as needed, enhancing traction and stability.
Driving Characteristics
The 4.0 BiTFSI powertrain delivers a remarkably smooth and effortless driving experience. The abundance of torque allows for brisk acceleration in virtually any gear, making overtaking maneuvers easy and safe. The eight-speed Tiptronic transmission shifts quickly and seamlessly, contributing to the overall refinement. Compared to the naturally aspirated 4.2-liter V8, the 4.0 BiTFSI offers significantly improved low-end response and overall performance. While the 3.0-liter supercharged V6 provides adequate power, the 4.0 BiTFSI delivers a more substantial and engaging driving experience. The quattro all-wheel-drive system provides excellent grip in all weather conditions, inspiring confidence. The long wheelbase of the “L” model contributes to a comfortable and composed ride, even on less-than-perfect road surfaces.
Equipment & Trim Levels
The A8 L 4.0 BiTFSI typically came standard with a high level of equipment, reflecting its position as the flagship model. Standard features included leather upholstery, heated and ventilated front seats with massage function, a premium sound system, a navigation system with MMI touch interface, adaptive air suspension, and a suite of advanced safety features. Optional extras included a rear-seat entertainment system, a panoramic sunroof, and various customization options for interior trim and exterior paint. The A8 L was often specified with higher-grade leather options and wood or carbon fiber interior trim.
Chassis & Braking
The A8 L features an independent suspension system on all four wheels, utilizing multi-link designs for both the front and rear axles. The adaptive air suspension allows the driver to adjust the ride height and damping characteristics, providing a balance between comfort and handling. Braking duties are handled by ventilated disc brakes on all four wheels, providing ample stopping power. The electronic stability control (ESC) system and anti-lock braking system (ABS) work in conjunction to enhance safety and stability.
Market Reception & Comparison
The A8 L 4.0 BiTFSI was generally well-received by automotive critics, who praised its powerful engine, refined ride, and luxurious interior. However, its fuel economy was often cited as a drawback, particularly compared to the more efficient 3.0-liter V6 model. In terms of reliability, the 4.0 BiTFSI engine has proven to be generally robust, although the complex turbocharging system and direct injection technology require regular maintenance. Compared to its rivals, such as the BMW 7 Series and Mercedes-Benz S-Class, the A8 L offered a unique blend of performance, luxury, and technology.
Legacy
The Audi A8 L (D4) 4.0 BiTFSI V8 quattro Tiptronic remains a desirable vehicle in the used car market today, particularly for those seeking a high-performance luxury sedan. The engine’s robust construction and the availability of parts contribute to its long-term reliability. While maintenance costs can be higher than those of simpler vehicles, the A8 L’s combination of power, luxury, and technology continues to appeal to discerning buyers. It represents a significant step forward in Audi’s engineering prowess and solidified the A8’s position as a true competitor in the luxury sedan segment.
