The Audi A8 L (D4, 4H facelift) 3.0 TDI, produced from 2014 to 2016, represents a significant iteration of Audi’s flagship luxury sedan. This variant, equipped with a 3.0-liter turbocharged diesel V6 engine producing 240 horsepower and paired with an eight-speed Tiptronic automatic transmission and Audi’s quattro all-wheel drive system, was positioned as a balance between performance, efficiency, and luxury within the A8 lineup. The “L” designation signifies a long-wheelbase version, prioritizing rear passenger space and comfort. This model was primarily aimed at markets where large, luxurious sedans with diesel powertrains were highly valued, particularly in Europe and Asia, though it was also available in North America.
Technical Specifications
| Brand | Audi |
| Model | A8 |
| Generation | A8L (D4,4H facelift 2013) |
| Type (Engine) | 3.0 TDI V6 (240 Hp) quattro Tiptronic |
| Start of production | 2014 |
| End of production | 2016 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (economy) – urban (EPA) | 9.8 l/100 km (24 US mpg, 28.8 UK mpg, 10.2 km/l) |
| Fuel consumption (economy) – extra urban (EPA) | 6.5 l/100 km (36.2 US mpg, 43.5 UK mpg, 15.4 km/l) |
| Fuel consumption (economy) – combined (EPA) | 8.4 l/100 km (28 US mpg, 33.6 UK mpg, 11.9 km/l) |
| Fuel Type | Diesel |
| Acceleration 0 – 60 mph | 6.3 sec |
| Maximum speed | 210 km/h (130.49 mph), Electronically limited |
| Emission standard | ULEV 2 |
| Weight-to-power ratio | 8.6 kg/Hp, 115.9 Hp/tonne |
| Weight-to-torque ratio | 3.6 kg/Nm, 280.2 Nm/tonne |
| Power | 240 Hp @ 3500 rpm |
| Power per litre | 80.9 Hp/l |
| Torque | 580 Nm @ 1750 rpm (427.79 lb.-ft. @ 1750 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | CPNB |
| Engine displacement | 2967 cm3 (181.06 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | V-engine |
| Cylinder Bore | 83 mm (3.27 in.) |
| Piston Stroke | 91.4 mm (3.6 in.) |
| Compression ratio | 16.3:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 6.4 l (6.76 US qt | 5.63 UK qt) |
| Coolant | 11.5 l (12.15 US qt | 10.12 UK qt) |
| Kerb Weight | 2070 kg (4563.57 lbs.) |
| Trunk (boot) space – minimum | 520 l (18.36 cu. ft.) |
| Fuel tank capacity | 82 l (21.66 US gal | 18.04 UK gal) |
| 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) | 0.26 |
| Minimum turning circle (turning diameter) | 12.7 m (41.67 ft.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives permanently the four wheels of the vehicle. |
| 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, Transverse stabilizer, Air suspension |
| Rear suspension | Independent on trapezoidal lever, Air suspension, Transverse stabilizer |
| Front brakes | Ventilated discs, 380 mm |
| Rear brakes | Ventilated discs, 356 mm |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 255/45 R19; 265/40 R20 |
| Wheel rims size | 9J x 19; 9J x 20 |
Powertrain & Engine Architecture
The heart of the A8 L 3.0 TDI is the CPNB engine code, a 3.0-liter V6 diesel engine. This engine utilizes a common rail direct injection system, delivering fuel at extremely high pressures for optimized combustion. The engine features a single turbocharger with an intercooler, boosting power and torque while managing exhaust gas temperatures. The valvetrain employs a Dual Overhead Camshaft (DOHC) design with four valves per cylinder, enhancing volumetric efficiency. The eight-speed Tiptronic automatic transmission is a torque-converter type, offering smooth and responsive gear changes. The Tiptronic function allows the driver to manually select gears for more control, while the automatic mode prioritizes efficiency and comfort. This transmission is specifically tuned to handle the high torque output of the diesel engine.
Driving Characteristics
The 240 horsepower and 427.79 lb.-ft. of torque produced by the 3.0 TDI engine provide ample power for effortless cruising and confident acceleration. While not as overtly sporty as the higher-output gasoline variants, the 3.0 TDI delivers a broad torque curve, making it responsive in everyday driving situations. The 0-60 mph time of 6.3 seconds is respectable for a large luxury sedan. The eight-speed Tiptronic transmission is well-matched to the engine, providing smooth shifts and keeping the engine in its optimal power band. Compared to the more powerful 4.0-liter TFSI V8, the 3.0 TDI prioritizes fuel efficiency and relaxed driving. The quattro all-wheel drive system provides excellent traction in all weather conditions, enhancing stability and control.
Equipment & Trim Levels
The A8 L 3.0 TDI typically came well-equipped with standard features such as leather upholstery, power-adjustable heated front seats, a premium sound system, a navigation system, and a sunroof. Optional extras included massaging front seats, rear seat entertainment, a head-up display, and advanced driver-assistance systems like adaptive cruise control and lane keeping assist. Trim levels varied by market, but generally offered upgrades in interior materials, exterior styling, and technology features. The long wheelbase provided generous rear legroom, making it a popular choice for chauffeur-driven executives.
Chassis & Braking
The A8 L features an independent suspension system at all four corners, utilizing air suspension for a smooth and comfortable ride. The air suspension allows for adjustable ride height and damping settings, adapting to different driving conditions. Front brakes are large ventilated discs measuring 380mm, while the rear brakes are also ventilated discs at 356mm. The standard ABS (Anti-lock Braking System) and electronic stability control enhance safety and control. The chassis is designed to minimize noise, vibration, and harshness, providing a refined driving experience.
Market Reception & Comparison
The A8 L 3.0 TDI was generally well-received by automotive critics, who praised its comfortable ride, refined interior, and fuel efficiency. The diesel engine offered a significant advantage in fuel economy compared to the gasoline variants, making it an attractive option for long-distance drivers. However, some critics noted that the 3.0 TDI lacked the outright performance of the more powerful engines. Compared to competitors like the BMW 7 Series and Mercedes-Benz S-Class, the A8 L 3.0 TDI offered a compelling combination of luxury, technology, and efficiency.
Legacy
The 3.0 TDI engine in the D4 A8 L has proven to be a relatively reliable powertrain, although like any diesel engine, it requires regular maintenance, including oil changes and diesel particulate filter (DPF) regeneration. The Tiptronic transmission is also generally durable, but proper fluid changes are essential for longevity. In the used car market, the A8 L 3.0 TDI remains a desirable option for buyers seeking a luxurious and fuel-efficient sedan. Its reputation for comfort, technology, and all-weather capability continues to attract buyers today. However, potential buyers should be aware of the potential costs associated with maintaining a complex luxury vehicle, including the possibility of expensive repairs to the air suspension or electronic systems.
