The Audi A6L Sedan (C8) 55 TFSI quattro S tronic, introduced in 2019, represents a significant iteration of Audi’s flagship executive sedan. This variant, positioned as a high-performance offering within the C8 A6L range, combines a potent 3.0-liter turbocharged V6 engine with Audi’s renowned quattro all-wheel-drive system and a seven-speed S tronic dual-clutch transmission. The “55 TFSI” designation reflects Audi’s power classification system, indicating a power output of approximately 340 horsepower. This model primarily caters to markets where a longer-wheelbase A6 is preferred, offering enhanced rear passenger space and a more luxurious experience. It serves as a direct competitor to BMW’s 5 Series and Mercedes-Benz’s E-Class, particularly those equipped with comparable engine and drivetrain configurations.
Technical Specifications
| Brand | Audi |
| Model | A6 |
| Generation | A6L Sedan (C8) |
| Type (Engine) | 55 TFSI (340 Hp) quattro S tronic |
| Start of production | 2019 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (economy) – urban | 10.5 l/100 km (22.4 US mpg, 26.9 UK mpg, 9.5 km/l) |
| Fuel consumption (economy) – extra urban | 6.6 l/100 km (35.6 US mpg, 42.8 UK mpg, 15.2 km/l) |
| Fuel consumption (economy) – combined | 8 l/100 km (29.4 US mpg, 35.3 UK mpg, 12.5 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 6.6 sec |
| Acceleration 0 – 62 mph | 6.6 sec |
| Acceleration 0 – 60 mph | 6.3 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 5.8 kg/Hp, 171.7 Hp/tonne |
| Weight-to-torque ratio | 4 kg/Nm, 252.5 Nm/tonne |
| Power | 340 Hp @ 5400-6400 rpm |
| Power per litre | 113.5 Hp/l |
| Torque | 500 Nm @ 1370-4500 rpm (368.78 lb.-ft. @ 1370-4500 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | DLZA |
| Engine displacement | 2995 cm3 (182.77 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | V-engine |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Turbocharger, Intercooler |
| Engine oil capacity | 7.6 l (8.03 US qt | 6.69 UK qt) |
| Kerb Weight | 1980-1995 kg (4365.15 – 4398.22 lbs.) |
| Trunk (boot) space – maximum | 430 l (15.19 cu. ft.) |
| Fuel tank capacity | 73 l (19.28 US gal | 16.06 UK gal) |
| Length | 5038-5050 mm (198.35 – 198.82 in.) |
| Width | 1886 mm (74.25 in.) |
| Width including mirrors | 2110 mm (83.07 in.) |
| Height | 1475 mm (58.07 in.) |
| Wheelbase | 3024 mm (119.06 in.) |
| Front track | 1630 mm (64.17 in.) |
| Rear (Back) track | 1616 mm (63.62 in.) |
| Front overhang | 919-921 mm (36.18 – 36.26 in.) |
| Rear overhang | 1095-1105 mm (43.11 – 43.5 in.) |
| Ride height (ground clearance) | 117 mm (4.61 in.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 7 gears, automatic transmission S tronic |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 245/45 R19 102Y XL; 255/40 R20 101Y XL |
| Wheel rims size | 19; 20 |
Powertrain & Engine Architecture
At the heart of the A6L 55 TFSI lies the DLZA engine, a 2.9-liter, 60-degree V6 engine. This engine utilizes a twin-scroll turbocharger with an integrated intercooler to deliver both high power and responsive torque. Direct fuel injection (DFI) is employed, operating at pressures up to 350 bar, ensuring precise fuel delivery and optimized combustion. The engine features four valves per cylinder and a variable valve timing system (Audi Valvelift) on both the intake and exhaust sides, further enhancing efficiency and performance. The S tronic seven-speed dual-clutch transmission provides rapid and seamless gear changes, contributing to the car’s brisk acceleration. This transmission allows for both fully automatic operation and manual gear selection via steering wheel-mounted paddles.
Driving Characteristics
The combination of the 340 hp engine and the S tronic transmission results in a driving experience that is both refined and engaging. Acceleration from 0 to 60 mph is achieved in approximately 6.3 seconds, and the car feels remarkably composed at highway speeds. The quattro all-wheel-drive system provides excellent traction in various conditions, enhancing stability and confidence. Compared to lower-powered A6L variants, the 55 TFSI offers significantly more potent acceleration and a more effortless feel, particularly during overtaking maneuvers. While not as overtly sporty as the S6 model, the 55 TFSI strikes a good balance between performance and comfort. The S tronic transmission’s quick shifts contribute to a responsive feel, although some drivers may find the transmission can be slightly jerky at low speeds.
Equipment & Trim Levels
The A6L 55 TFSI quattro S tronic typically comes well-equipped as standard. Features commonly include leather upholstery, tri-zone automatic climate control, a premium sound system, and a comprehensive suite of driver-assistance systems such as adaptive cruise control, lane-keeping assist, and automatic emergency braking. The MMI touch response system, with its dual touchscreen displays, provides intuitive control over vehicle functions and infotainment. Optional extras often include a head-up display, massaging front seats, and a panoramic sunroof. Interior trim options typically include a choice of wood or aluminum inlays, allowing for a degree of personalization.
Chassis & Braking
The C8 A6L utilizes a sophisticated chassis design featuring a multi-link suspension system at both the front and rear. The suspension is tuned to provide a comfortable ride while maintaining good handling characteristics. The 55 TFSI variant typically features larger brakes compared to lower-powered models, ensuring adequate stopping power. Front brakes are typically ventilated discs, while rear brakes may be either discs or drums depending on the specific configuration and market. The steering system is an electromechanical power steering system, offering precise and responsive steering feel.
Market Reception & Comparison
The Audi A6L 55 TFSI quattro S tronic was generally well-received by automotive critics. Praise was directed towards its powerful engine, refined ride quality, and advanced technology. Fuel economy, while respectable for a vehicle of this size and performance, was not a standout feature compared to some of its competitors. Compared to the A6L 45 TFSI (2.0-liter four-cylinder), the 55 TFSI offered a substantial performance upgrade, justifying its higher price point for buyers prioritizing power and responsiveness. Against rivals like the BMW 540i and Mercedes-Benz E450, the A6L 55 TFSI held its own in terms of performance and features, often being praised for its interior design and technology integration.
Legacy
The DLZA engine, found in the A6L 55 TFSI, has proven to be a relatively reliable powertrain. While some early models experienced minor software glitches, these were generally addressed through software updates. The S tronic transmission, while generally robust, requires regular maintenance, including fluid changes, to ensure long-term reliability. On the used car market, the A6L 55 TFSI commands a premium over lower-powered variants due to its performance and desirable features. Its combination of luxury, performance, and technology continues to make it an attractive option for buyers seeking a high-end executive sedan.
