The Audi A8L (D5) 55 TFSI V6, produced from 2017 to 2019, represents a significant iteration of Audi’s flagship luxury sedan. Positioned as a mid-range offering within the fourth-generation A8 (D5) lineup, it bridged the gap between the entry-level 50 TFSI and the high-performance 60 TFSI variants. This model distinguished itself through a combination of potent performance, advanced technology, and a focus on refined comfort, catering to buyers seeking a sophisticated and capable grand tourer. The “55 TFSI” designation reflects Audi’s power indexing, indicating a 340 horsepower output. It was primarily sold in European and Asian markets, with limited availability in the United States.
Technical Specifications
| Brand | Audi |
| Model | A8 |
| Generation | A8L (D5) |
| Type (Engine) | 55 TFSI V6 (340 Hp) Mild Hybrid quattro tiptronic |
| Start of production | 2017 |
| End of production | 2019 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 10.1-10.3 l/100 km (23.3 – 22.8 US mpg) |
| Fuel consumption (extra urban) | 6.0-6.4 l/100 km (39.2 – 36.8 US mpg) |
| Fuel consumption (combined) | 7.5-7.8 l/100 km (31.4 – 30.2 US mpg) |
| CO2 emissions | 171-178 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.7 sec |
| Acceleration 0 – 62 mph | 5.7 sec |
| Acceleration 0 – 60 mph | 5.4 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 5.7 kg/Hp |
| Weight-to-torque ratio | 3.9 kg/Nm |
| Net battery capacity | 0.5 kWh |
| Battery voltage | 48 V |
| Battery technology | Lithium-ion (Li-Ion) |
| Battery weight | 10 kg (22.05 lbs) |
| Battery location | Under the trunk |
| Recuperation output | 14 kW |
| Electric motor power | 8 Hp |
| Electric motor Torque | 60 Nm (44.25 lb.-ft.) |
| Engine Power | 340 Hp @ 5000-6400 rpm |
| Engine Torque | 500 Nm @ 1370-4500 rpm (368.78 lb.-ft.) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | EA839 / CZSE |
| Engine displacement | 2995 cm3 (182.77 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | V-engine |
| Cylinder Bore | 84.5 mm (3.33 in.) |
| Piston Stroke | 89 mm (3.5 in.) |
| Compression ratio | 11.2:1 |
| Fuel injection system | Direct injection |
| Engine aspiration | Twin-scroll turbo, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 7.6 l (8.03 US qt | 6.69 UK qt) |
| Coolant capacity | 11 l (11.62 US qt | 9.68 UK qt) |
| Kerb Weight | 1945 kg (4287.99 lbs) |
| Max. weight | 2745 kg (6051.69 lbs) |
| Max load | 800 kg (1763.7 lbs) |
| Trunk (boot) space (minimum) | 505 l (17.83 cu. ft.) |
| Fuel tank capacity | 72 l (19.02 US gal | 15.84 UK gal) |
| Wheelbase | 3128 mm (123.15 in.) |
| Length | 5302 mm (208.74 in.) |
| Width | 1945 mm (76.57 in.) |
| Height | 1485 mm (58.46 in.) |
| Gearbox | 8-speed automatic (tiptronic) |
INTRODUCTION
The Audi A8L (D5) 55 TFSI V6, launched in 2017, represented a significant step forward in luxury sedan technology. Built on the modular longitudinal platform (MLB evo), also known as the 1HX0 platform, it shared its underpinnings with other Volkswagen Group vehicles like the Porsche Panamera and Bentley Continental GT. The A8L designation signifies the long-wheelbase version, prioritizing rear passenger space and comfort. This 55 TFSI variant was designed to offer a balance between performance and efficiency, appealing to buyers who desired a powerful yet relatively economical driving experience. It served as a key model in Audi’s lineup, showcasing their commitment to innovation and refinement.
Powertrain & Engine Architecture
At the heart of the A8L 55 TFSI lies the EA839 3.0-liter V6 engine, specifically coded CZSE. This engine is a direct-injection, twin-scroll turbocharged powerplant, benefiting from Audi’s years of experience in forced induction. The twin-scroll turbocharger design minimizes turbo lag and enhances responsiveness across the rev range. The engine utilizes a 11.2:1 compression ratio and a sophisticated direct injection system to maximize efficiency and power output. Crucially, this variant incorporates a 48-volt mild-hybrid system. This system features a belt-driven starter-generator (BSG) and a small lithium-ion battery, enabling features like extended engine-off coasting, smoother start-stop operation, and a slight power boost during acceleration. The engine is paired with Audi’s eight-speed tiptronic automatic transmission, known for its smooth and quick shifts. The transmission is designed to handle the engine’s substantial torque output and contributes to the car’s overall refined driving experience.
Driving Characteristics
The A8L 55 TFSI delivers a composed and effortless driving experience. The 340 horsepower and 368.78 lb-ft of torque provide ample power for both city driving and highway cruising. Acceleration from 0-60 mph takes approximately 5.4 seconds, making it a genuinely quick luxury sedan. The eight-speed tiptronic transmission is well-tuned, offering seamless gear changes and contributing to a relaxed driving feel. Compared to the more powerful 60 TFSI variant, the 55 TFSI offers a slightly less aggressive throttle response, prioritizing comfort and refinement. While the 60 TFSI provides a more visceral experience, the 55 TFSI excels in providing a smooth, quiet, and comfortable ride. The mild-hybrid system subtly enhances the driving experience, providing a small boost during acceleration and improving fuel economy. The quattro all-wheel-drive system ensures excellent traction and stability in all weather conditions.
Equipment & Trim Levels
The A8L 55 TFSI came generously equipped as standard. Key features included leather upholstery, heated and ventilated front seats with massage function, a panoramic sunroof, a premium sound system, and Audi’s MMI touch response infotainment system with dual touchscreens. Optional extras included a rear-seat entertainment system, a head-up display, and various driver-assistance features such as adaptive cruise control, lane keeping assist, and a 360-degree camera system. Interior trim options ranged from wood veneers to aluminum accents, allowing buyers to personalize the cabin to their preferences. The long-wheelbase configuration provided exceptional rear passenger legroom, making it an ideal choice for chauffeured transport or long journeys.
Chassis & Braking
The A8L 55 TFSI features an independent multi-link suspension at both the front and rear, coupled with Audi’s adaptive air suspension system. This system allows the ride height to be adjusted, providing a comfortable ride over various road surfaces. The air suspension also contributes to the car’s stability at higher speeds. Braking duties are handled by ventilated discs 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 control. The steering is a power-assisted rack-and-pinion system, offering precise and responsive handling.
Market Reception & Comparison
The A8L 55 TFSI was generally well-received by automotive critics. It was praised for its refined ride, powerful engine, and luxurious interior. However, some reviewers noted that the infotainment system could be complex to operate. Compared to the 50 TFSI variant, the 55 TFSI offered a significant performance upgrade without sacrificing fuel economy. Against competitors like the BMW 7 Series and Mercedes-Benz S-Class, the A8L 55 TFSI offered a compelling combination of technology, comfort, and performance. Fuel economy figures of around 31.4 mpg combined were competitive within the luxury sedan segment.
Legacy
The Audi A8L (D5) 55 TFSI V6 has proven to be a reliable and durable luxury sedan. The EA839 engine is known for its longevity, and the mild-hybrid system has generally been trouble-free. In the used car market, these models hold their value relatively well, particularly those with low mileage and a comprehensive service history. While maintenance costs can be higher than those of more mainstream vehicles, the A8L 55 TFSI offers a sophisticated and rewarding ownership experience for those seeking a high-end luxury sedan.
