The Audi A8 L (D3, 4E) facelift of 2005, specifically equipped with the 6.0 W12 engine producing 450 horsepower and paired with the Tiptronic automatic transmission and quattro all-wheel drive, represented the pinnacle of Audi’s luxury sedan offerings during its production run from 2005 to 2007. This variant sat at the very top of the A8L range, offering a significant step up in performance and prestige compared to the 3.2 V6 and 4.2 V8 models. It was positioned as a direct competitor to the BMW 760i and Mercedes-Benz S600, aiming to deliver a blend of opulent comfort, cutting-edge technology, and impressive performance. The “L” designation indicated a long-wheelbase version, prioritizing rear passenger space and comfort.
Technical Specifications
| Brand | Audi |
| Model | A8 |
| Generation | A8L (D3, 4E, facelift 2005) |
| Type (Engine) | 6.0 W12 (450 Hp) quattro Tiptronic |
| Start of production | 2005 |
| End of production | 2007 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (economy) – urban | 20.1 l/100 km (11.7 US mpg, 14.1 UK mpg, 5 km/l) |
| Fuel consumption (economy) – extra urban | 9.8 l/100 km (24 US mpg, 28.8 UK mpg, 10.2 km/l) |
| Fuel consumption (economy) – combined | 13.6 l/100 km (17.3 US mpg, 20.8 UK mpg, 7.4 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.2 sec |
| Acceleration 0 – 62 mph | 5.2 sec |
| Acceleration 0 – 60 mph | 4.9 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 4 |
| Weight-to-power ratio | 4.4 kg/Hp, 225.6 Hp/tonne |
| Weight-to-torque ratio | 3.4 kg/Nm, 290.7 Nm/tonne |
| Power | 450 Hp @ 6200 rpm |
| Power per litre | 75 Hp/l |
| Torque | 580 Nm @ 4000-4700 rpm (427.79 lb.-ft. @ 4000-4700 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | BHT, BSB, BTE |
| Engine displacement | 5998 cm3 (366.02 cu. in.) |
| Number of cylinders | 12 |
| Engine configuration | W-engine |
| Cylinder Bore | 84 mm (3.31 in.) |
| Piston Stroke | 90.2 mm (3.55 in.) |
| Compression ratio | 10.75:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC |
| Engine oil capacity | 10.5 l (11.1 US qt, 9.24 UK qt) |
| Coolant | 18.9 l (19.97 US qt, 16.63 UK qt) |
| Kerb Weight | 1995 kg (4398.22 lbs.) |
| Max. weight | 2545 kg (5610.76 lbs.) |
| Max load | 550 kg (1212.54 lbs.) |
| Trunk (boot) space – minimum | 500 l (17.66 cu. ft.) |
| Fuel tank capacity | 90 l (23.78 US gal, 19.8 UK gal) |
| Length | 5192 mm (204.41 in.) |
| Width | 1894 mm (74.57 in.) |
| Height | 1455 mm (57.28 in.) |
| Wheelbase | 3074 mm (121.02 in.) |
| Front track | 1619 mm (63.74 in.) |
| Rear (Back) track | 1605 mm (63.19 in.) |
| Drag coefficient (Cd) | 0.28 |
| Minimum turning circle (turning diameter) | 12.5 m (41.01 ft.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 6 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 | Hydraulic Steering |
| Tires size | 235/55 R17 |
| Wheel rims size | 8J x 17 |
Powertrain & Engine Architecture
The heart of this A8 L variant is the 6.0-liter W12 engine, designated with engine codes BHT, BSB, or BTE depending on minor variations and market specifications. This engine is essentially two narrow-angle VR6 engines joined at a common crankshaft, resulting in a compact and relatively lightweight twelve-cylinder configuration. It features a 10.75:1 compression ratio and utilizes multi-port fuel injection. The dual overhead camshafts (DOHC) control four valves per cylinder, optimizing airflow for increased power output. The W12 is naturally aspirated, meaning it doesn’t rely on turbocharging or supercharging for forced induction.
The Tiptronic 6-speed automatic transmission was specifically chosen to handle the substantial torque output of the W12 engine. This transmission offers both fully automatic operation and a manual shift mode, allowing the driver to exert more control over gear selection. The quattro all-wheel-drive system distributes power between all four wheels, enhancing traction and stability, particularly in adverse weather conditions.
Driving Characteristics
The 6.0 W12 A8 L delivers a remarkably smooth and refined driving experience. The engine provides effortless acceleration, with 0-60 mph times consistently around 4.9 seconds. The Tiptronic transmission, while not as quick-shifting as some modern dual-clutch transmissions, offers smooth and predictable gear changes. The quattro all-wheel-drive system provides excellent grip and stability, inspiring confidence in various driving conditions. However, the sheer weight of the vehicle (approximately 4400 lbs) is noticeable, particularly during spirited driving. Compared to the 4.2 V8, the W12 offers significantly more power and torque, resulting in a more relaxed and effortless cruising experience. The 3.2 V6, while more fuel-efficient, feels significantly underpowered in comparison.
Equipment & Trim Levels
The A8 L 6.0 W12 came standard with a comprehensive array of luxury features, including leather upholstery, heated and ventilated front seats with massage function, a premium sound system, a navigation system, and a sunroof. Wood trim adorned the interior, adding to the sense of opulence. Optional extras included rear-seat entertainment, adaptive cruise control, and upgraded leather packages. The long wheelbase provided generous rear legroom, making it a particularly appealing choice for chauffeured transport.
Chassis & Braking
The A8 L featured an independent multi-link suspension at the front and an independent trapezoidal lever suspension at the rear, providing a comfortable and controlled ride. Ventilated disc brakes were fitted on all four wheels, providing ample stopping power. The car was equipped with ABS (Anti-lock Braking System) and electronic stability control as standard safety features. The steering utilized a hydraulic power steering system, offering a balanced feel and precise control.
Market Reception & Comparison
Critics praised the A8 L 6.0 W12 for its powerful engine, luxurious interior, and refined driving experience. However, its high price tag and relatively poor fuel economy (around 17.3 US mpg combined) were often cited as drawbacks. Compared to its rivals, the A8 L offered a unique blend of performance and comfort, but the BMW 760i was often considered to be more engaging to drive, while the Mercedes-Benz S600 offered a more traditional luxury experience.
Legacy
The Audi A8 L 6.0 W12 (D3, 4E) remains a desirable vehicle among enthusiasts and collectors. The W12 engine, while complex, has proven to be relatively reliable when properly maintained. Common issues include oil leaks and occasional electrical gremlins. Today, these cars can be found on the used car market at relatively affordable prices, offering a unique opportunity to experience a high-performance luxury sedan from the early 2000s. The combination of its powerful engine, luxurious features, and all-wheel-drive capability continues to make it a compelling choice for those seeking a grand touring experience.
