The Audi A8 L (D4, 4H) 6.3 FSI W12 quattro Tiptronic represents the pinnacle of luxury and performance within the fourth generation (D4) of Audi’s flagship sedan. Produced briefly in 2011, this variant was offered exclusively with a long wheelbase (“L”) configuration, emphasizing rear passenger comfort. It occupied the very top of the A8 range, positioned above the 4.2 FSI and 3.0 TDI models, catering to buyers seeking uncompromising power and refinement. The D4 generation A8, launched in 2010, introduced significant advancements in lightweight construction with its aluminum hybrid body, and the W12 model showcased Audi’s engineering prowess.
Technical Specifications
| Brand | Audi |
| Model | A8 |
| Generation | A8L (D4, 4H) |
| Type (Engine) | 6.3 FSI W12 (500 Hp) quattro Tiptronic |
| Start of production | January, 2011 |
| End of production | 2011 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 4 |
| Doors | 4 |
| Fuel consumption (urban) | 18.2 l/100 km (12.9 US mpg, 15.5 UK mpg, 5.5 km/l) |
| Fuel consumption (extra urban) | 9 l/100 km (26.1 US mpg, 31.4 UK mpg, 11.1 km/l) |
| Fuel consumption (combined) | 12.4 l/100 km (19 US mpg, 22.8 UK mpg, 8.1 km/l) |
| CO2 emissions | 290 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 4.9 sec |
| Acceleration 0 – 62 mph | 4.9 sec |
| Acceleration 0 – 60 mph | 4.7 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 4.1 kg/Hp, 243.3 Hp/tonne |
| Weight-to-torque ratio | 3.3 kg/Nm, 304.1 Nm/tonne |
| Power | 500 Hp @ 6200 rpm |
| Power per litre | 79.4 Hp/l |
| Torque | 625 Nm @ 3250 rpm (460.98 lb.-ft. @ 3250 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | CEJA |
| Engine displacement | 6299 cm3 (384.39 cu. in.) |
| Number of cylinders | 12 |
| Engine configuration | W-engine |
| Cylinder Bore | 86 mm (3.39 in.) |
| Piston Stroke | 90.4 mm (3.56 in.) |
| Compression ratio | 11.8:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC |
| Engine oil capacity | 11.2 l (11.83 US qt | 9.85 UK qt) |
| Coolant | 15 l (15.85 US qt | 13.2 UK qt) |
| Kerb Weight | 2055 kg (4530.5 lbs.) |
| Max. weight | 2655 kg (5853.27 lbs.) |
| Max load | 600 kg (1322.77 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) |
| Permitted trailer load with brakes (8%) | 2300 kg (5070.63 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 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 | 255/45 R19 |
| Wheel rims size | 9.0J x 19 |
Powertrain & Engine Architecture
The heart of the A8 L 6.3 FSI is the CEJA engine, a 6.3-liter naturally aspirated W12. This engine is essentially two narrow-angle VR6 engines sharing a common crankshaft. This configuration results in a remarkably smooth and refined power delivery. The engine utilizes direct fuel injection (FSI) and a double overhead camshaft (DOHC) valvetrain with four valves per cylinder. The direct injection system allows for precise fuel metering, enhancing both power and efficiency. Paired with the engine is an eight-speed Tiptronic automatic transmission, providing smooth and responsive gear changes. The quattro all-wheel-drive system distributes power between all four wheels, ensuring optimal traction in various conditions.
Driving Characteristics
The 500 horsepower and 460 lb-ft of torque produced by the W12 engine deliver exhilarating performance. Acceleration from 0 to 60 mph takes just 4.7 seconds, and the car is electronically limited to a top speed of 155 mph. The Tiptronic transmission, while offering manual shift control, is primarily geared towards providing a seamless and comfortable driving experience. Compared to the 4.2 FSI or 3.0 TDI models, the W12 offers significantly more power and a more refined driving experience, but at the cost of increased fuel consumption. The long wheelbase contributes to a supremely comfortable ride, particularly noticeable on long journeys.
Equipment & Trim Levels
As the flagship model, the A8 L 6.3 FSI came standard with a comprehensive array of luxury features. These included premium leather upholstery, heated and ventilated front and rear seats with massage function, a panoramic sunroof, a Bang & Olufsen sound system, and advanced driver-assistance systems such as adaptive cruise control and lane departure warning. Optional extras included rear-seat entertainment, a refrigerator, and various customization options for interior trim and exterior paint.
Chassis & Braking
The A8 L’s chassis features an aluminum hybrid construction, contributing to its relatively low weight despite its size. The suspension utilizes an independent multi-link setup at all four corners, providing a comfortable and controlled ride. Large ventilated disc brakes on all wheels provide ample stopping power. The electronic stability control (ESC) system works in conjunction with the quattro all-wheel-drive system to maintain stability and control in challenging driving conditions.
Market Reception & Comparison
The A8 L 6.3 FSI W12 was praised by automotive critics for its exceptional performance, luxurious interior, and refined driving experience. However, its high price tag and relatively poor fuel economy limited its appeal to a niche market. Compared to competitors such as the BMW 760i and Mercedes-Benz S600, the A8 L offered a unique blend of performance, luxury, and technology. The W12 variant was significantly more expensive than the 4.2 FSI and 3.0 TDI models, but offered a substantial performance upgrade.
Legacy
The CEJA W12 engine, while complex, has proven to be relatively reliable when properly maintained. Common issues include oil leaks and occasional problems with the direct injection system. Today, the A8 L 6.3 FSI W12 represents a desirable and collectible luxury sedan. Its combination of performance, luxury, and rarity makes it a sought-after vehicle among enthusiasts. Maintenance costs, however, remain high due to the complexity of the engine and the availability of specialized parts.
