The Audi S6 (C8) 3.0 TDI V6, produced from November 2020 to May 2023, represents a compelling blend of performance and efficiency within the executive sedan segment. Positioned as a diesel-powered variant of the C8 generation S6, it offered a sophisticated alternative to its gasoline-fueled siblings, particularly in European markets where diesel engines remained popular. This model combined a potent turbocharged V6 diesel engine with a mild hybrid system and Audi’s renowned quattro all-wheel drive, delivering a refined driving experience and strong performance figures. It occupied a middle ground in the S6 lineup, offering a balance between the outright performance of the gasoline variants and the fuel economy focus of lower-powered diesel options.
Technical Specifications
| Brand | Audi |
| Model | S6 |
| Generation | S6 (C8) |
| Type (Engine) | 3.0 TDI V6 (344 Hp) Mild Hybrid quattro tiptronic |
| Start of production | November, 2020 |
| End of production | May, 2023 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Combined fuel consumption (WLTP) | 6.9-7.3 l/100 km (34.1 – 32.2 US mpg, 40.9 – 38.7 UK mpg, 14.5 – 13.7 km/l) |
| CO2 emissions (WLTP) | 182-191 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 5 sec |
| Acceleration 0 – 62 mph | 5 sec |
| Acceleration 0 – 60 mph | 4.8 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6d-ISC-FCM |
| Weight-to-power ratio | 5.7 kg/Hp, 176 Hp/tonne |
| Weight-to-torque ratio | 2.8 kg/Nm, 358.1 Nm/tonne |
| Gross battery capacity | 0.5 kWh |
| Battery voltage | 48 V |
| Battery technology | Lithium-ion (Li-Ion) |
| Battery location | Under the trunk |
| Recuperation output | 8 kW |
| Power | 344 Hp @ 3850-4000 rpm |
| Power per litre | 115.9 Hp/l |
| Torque | 700 Nm @ 1750-3250 rpm (516.29 lb.-ft. @ 1750-3250 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | EA897evo3 / DMKD |
| 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 | 15.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger and Electric Powered Compressor, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 6.1 l (6.45 US qt | 5.37 UK qt) |
| Coolant | 16.7 l (17.65 US qt | 14.69 UK qt) |
| Kerb Weight | 1955 kg (4310.04 lbs.) |
| Max. weight | 2590 kg (5709.97 lbs.) |
| Max load | 635 kg (1399.94 lbs.) |
| Trunk (boot) space – minimum | 520 l (18.36 cu. ft.) |
| Fuel tank capacity | 63 l (16.64 US gal | 13.86 UK gal) |
| AdBlue tank | 22 l (5.81 US gal | 4.84 UK gal) |
| Max. roof load | 90 kg (198.42 lbs.) |
| Permitted trailer load with brakes (8%) | 2100 kg (4629.71 lbs.) |
| Permitted trailer load with brakes (12%) | 2100 kg (4629.71 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 95 kg (209.44 lbs.) |
| Length | 4954 mm (195.04 in.) |
| Width | 1886 mm (74.25 in.) |
| Width including mirrors | 2110 mm (83.07 in.) |
| Height | 1446 mm (56.93 in.) |
| Wheelbase | 2928 mm (115.28 in.) |
| Front track | 1620 mm (63.78 in.) |
| Rear (Back) track | 1603 mm (63.11 in.) |
| Front overhang | 924 mm (36.38 in.) |
| Rear overhang | 1102 mm (43.39 in.) |
| Drag coefficient (Cd) | 0.28 |
| Minimum turning circle (turning diameter) | 12.1 m (39.7 ft.) |
| Approach angle | 13.9° |
| Departure angle | 12.8° |
| Number of gears and type of gearbox | 8 gears, automatic transmission tiptronic |
| Front suspension | Independent multi-link suspension |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs, 400 mm |
| Rear brakes | Ventilated discs, 350 mm |
Powertrain & Engine Architecture
At the heart of the S6 (C8) 3.0 TDI lies the EA897evo3 engine, a 3.0-liter V6 diesel. This engine, designated with the code DMKD, represents a significant evolution in Volkswagen Group’s diesel technology. It features a sophisticated turbocharging system, incorporating both a conventional turbocharger and an electric powered compressor (EPC). The EPC is designed to eliminate turbo lag, providing near-instantaneous boost at low engine speeds, enhancing responsiveness. The engine utilizes a diesel commonrail fuel injection system, delivering highly precise fuel metering for optimal combustion. The valvetrain employs a Dual Overhead Camshaft (DOHC) configuration with four valves per cylinder, maximizing airflow and contributing to the engine’s power output. The mild hybrid system, operating at 48V, integrates a belt starter generator (BSG) and a small lithium-ion battery. This system enables features like extended engine-off coasting, regenerative braking, and a smoother start-stop function, improving fuel efficiency. The engine is paired with an 8-speed tiptronic automatic transmission, known for its smooth and quick shifts. This transmission is specifically tuned to complement the engine’s torque characteristics, providing seamless acceleration.
Driving Characteristics
The 3.0 TDI V6 automatic combination in the S6 C8 delivers a distinctly different driving experience compared to the higher-output gasoline variants. While lacking the outright acceleration of the TFSI engines, the TDI offers a substantial 700 Nm (516 lb-ft) of torque available from a low 1750 rpm. This results in strong mid-range acceleration and effortless overtaking capabilities. The 8-speed tiptronic transmission is well-matched to the engine, providing smooth and timely gear changes. The mild hybrid system contributes to a refined driving experience, particularly in urban environments, where the engine can frequently shut off during coasting and at traffic lights. The quattro all-wheel drive system ensures excellent traction and stability in all weather conditions. Compared to a manual transmission equipped S6, the automatic version prioritizes comfort and ease of use over driver engagement. The gear ratios are optimized for both performance and fuel economy, providing a balance between responsiveness and efficiency.
Equipment & Trim Levels
The S6 3.0 TDI typically came well-equipped as standard. Interior features included premium leather upholstery, power-adjustable and heated front seats, a multi-function steering wheel, and a high-resolution infotainment system with navigation. Standard safety features included Audi’s pre-sense basic and pre-sense city systems, lane departure warning, and a rearview camera. Optional extras included a Bang & Olufsen sound system, a head-up display, adaptive cruise control, and a panoramic sunroof. The interior trim could be customized with various wood or carbon fiber inlays. Exterior options included different wheel designs and exterior styling packages.
Chassis & Braking
The S6 C8 features a sophisticated chassis designed to deliver a comfortable yet sporty ride. It utilizes an independent multi-link suspension system at both the front and rear axles. The suspension is tuned to provide a balance between ride comfort and handling precision. The standard braking system consists of ventilated discs on all four wheels, with larger discs (400mm front, 350mm rear) compared to the standard A6. The electronic stability control (ESC) system is integrated with the quattro all-wheel drive system to enhance stability and control. Available options included adaptive air suspension, which allowed the driver to adjust the ride height and damping characteristics.
Market Reception & Comparison
The Audi S6 3.0 TDI was generally well-received by automotive critics, particularly in Europe. It was praised for its strong performance, refined driving experience, and excellent fuel economy. Compared to the gasoline-powered S6 variants, the TDI offered a more economical option without sacrificing a significant amount of performance. However, some critics noted that the diesel engine lacked the responsiveness and sound of the TFSI engines. In terms of reliability, the EA897evo3 engine has proven to be generally robust, although diesel particulate filter (DPF) issues can occur with frequent short trips. Fuel economy figures consistently demonstrated the TDI’s advantage over its gasoline counterparts.
Legacy
The Audi S6 (C8) 3.0 TDI V6 represents a high point in diesel-powered performance sedans. While diesel engines have faced increasing scrutiny in recent years, this model remains a desirable option for those seeking a blend of performance, efficiency, and refinement. On the used car market, well-maintained examples of the S6 3.0 TDI command a premium due to their reputation for reliability and driving enjoyment. The powertrain, while complex, has proven to be durable when properly maintained, making it a viable long-term ownership proposition. The integration of mild hybrid technology also foreshadowed the industry’s broader shift towards electrification.
