The Audi A6 Avant (C8, facelift 2023) 40 TDI represents a refined iteration of Audi’s popular executive wagon, introduced in June 2023 and continuing through March 2025. This variant, positioned as a mid-range offering within the C8 A6 Avant lineup, combines a 2.0-liter turbocharged diesel engine with a mild hybrid system and Audi’s quattro ultra all-wheel-drive system, paired with a seven-speed S tronic dual-clutch transmission. It caters to buyers seeking a balance of performance, efficiency, and practicality in a premium package. The facelift brought updated styling, enhanced technology, and refined powertrain options to the A6 family.
Technical Specifications
| Brand | Audi |
| Model | A6 |
| Generation | A6 Avant (C8, facelift 2023) |
| Type (Engine) | 40 TDI (204 Hp) Mild Hybrid quattro ultra S tronic |
| Start of production | June, 2023 |
| End of production | March, 2025 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | Station wagon (estate) |
| Seats | 5 |
| Doors | 5 |
| Combined fuel consumption (WLTP) | 5.6-6.4 l/100 km (42 – 36.8 US mpg) |
| CO2 emissions (WLTP) | 146-167 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 7.6 sec |
| Acceleration 0 – 62 mph | 7.6 sec |
| Acceleration 0 – 60 mph | 7.2 sec |
| Maximum speed | 241 km/h (149.75 mph) |
| Emission standard | Euro 6e |
| Weight-to-power ratio | 8.7 kg/Hp |
| Weight-to-torque ratio | 4.4 kg/Nm |
| Net (usable) battery capacity | 0.15 kWh |
| Battery voltage | 12 V |
| Battery technology | Lithium-ion (Li-Ion) |
| Recuperation output | 6 kW |
| Electric motor power | 3 Hp |
| Electric motor Torque | 60 Nm (44.25 lb.-ft.) |
| Power | 204 Hp @ 3800-4200 rpm |
| Torque | 400 Nm @ 1750-3250 rpm (295.02 lb.-ft. @ 1750-3250 rpm) |
| Engine displacement | 1968 cm3 (120.09 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 81 mm (3.19 in.) |
| Piston Stroke | 95.5 mm (3.76 in.) |
| Compression ratio | 15.5:1 |
| Fuel injection system | Diesel Commonrail |
| Engine oil capacity | 5.5 l (5.81 US qt | 4.84 UK qt) |
| Coolant | 12.1 l (12.79 US qt | 10.65 UK qt) |
| Kerb Weight | 1770 kg (3902.18 lbs.) |
| Max. weight | 2425 kg (5346.21 lbs.) |
| Max load | 655 kg (1444.03 lbs.) |
| Trunk (boot) space – minimum | 565 l (19.95 cu. ft.) |
| Trunk (boot) space – maximum | 1680 l (59.33 cu. ft.) |
| Fuel tank capacity | 63 l (16.64 US gal | 13.86 UK gal) |
| AdBlue tank | 12 l (3.17 US gal | 2.64 UK gal) |
| Max. roof load | 100 kg (220.46 lbs.) |
| Permitted trailer load with brakes (8%) | 2000 kg (4409.25 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Length | 4939 mm (194.45 in.) |
| Width | 1886 mm (74.25 in.) |
| Height | 1494 mm (58.82 in.) |
| Wheelbase | 2924 mm (115.12 in.) |
| Front track | 1630 mm (64.17 in.) |
| Rear track | 1617 mm (63.66 in.) |
| Front brakes | Ventilated discs, 318 mm |
| Rear brakes | Disc, 300 mm |
| Gearbox | 7 gears, automatic transmission S tronic |
INTRODUCTION
The Audi A6 Avant (C8) represents the fifth generation of Audi’s A6 series, launched in 2018. The 2023 facelift brought significant updates to the exterior styling, interior technology, and powertrain options. The 40 TDI variant, equipped with a 2.0-liter diesel engine, mild hybrid technology, and the S tronic transmission, is a popular choice in European markets, offering a compelling blend of efficiency and performance. The “ultra” designation within the quattro system indicates a more demand-responsive all-wheel-drive setup, prioritizing front-wheel drive for efficiency and engaging the rear wheels when needed. This model is positioned as a practical and sophisticated option for families and business users alike.
Powertrain & Engine Architecture
At the heart of the A6 Avant 40 TDI lies the EA288evo 2.0-liter inline-four cylinder diesel engine. This engine utilizes a sophisticated common-rail direct injection system, delivering fuel at extremely high pressures for optimized combustion. The engine features a turbocharger with an intercooler, boosting power and torque. The valvetrain employs a Dual Overhead Camshaft (DOHC) configuration with four valves per cylinder, enhancing breathing and efficiency. The mild hybrid system incorporates a 48-volt electrical system and a belt starter generator (BSG), enabling features like extended start-stop operation, coasting with the engine off, and a small power boost during acceleration. The seven-speed S tronic dual-clutch transmission provides rapid and smooth gear changes, contributing to both performance and fuel economy. This transmission is known for its efficiency and responsiveness, offering both automatic and manual shift modes.
Driving Characteristics
The 40 TDI variant delivers a refined and comfortable driving experience. With 204 horsepower and 400 Nm (295 lb-ft) of torque, it provides ample power for everyday driving and long-distance journeys. Acceleration from 0 to 100 km/h (0-62 mph) takes 7.6 seconds. The S tronic transmission’s quick shifts and the mild hybrid system’s assistance contribute to a responsive feel. Compared to higher-output A6 variants like the 50 TDI, the 40 TDI offers a more relaxed and fuel-efficient driving experience. While it doesn’t provide the same level of outright performance, it excels in providing a smooth and effortless ride. The quattro ultra all-wheel-drive system provides excellent traction in various weather conditions, enhancing stability and confidence.
Equipment & Trim Levels
The A6 Avant 40 TDI typically comes well-equipped as standard. Features include Audi’s Virtual Cockpit digital instrument cluster, a touchscreen infotainment system with navigation, leather upholstery, tri-zone automatic climate control, and a suite of driver-assistance systems such as lane departure warning, adaptive cruise control, and automatic emergency braking. Optional extras include a Bang & Olufsen premium sound system, matrix LED headlights, a head-up display, and massaging front seats. Trim levels often vary by market, but generally offer options for upgraded interior materials, exterior styling enhancements, and additional technology features.
Chassis & Braking
The A6 Avant features an independent multi-link suspension setup at both the front and rear axles, providing a comfortable and controlled ride. The suspension is tuned to balance handling and comfort, offering a good compromise for everyday driving. The braking system consists of ventilated discs at the front and solid discs at the rear. ABS (Anti-lock Braking System) is standard, along with electronic stability control. The steering is an electric power-assisted rack and pinion system, providing precise and responsive steering feel.
Market Reception & Comparison
The A6 Avant 40 TDI has been well-received by automotive critics for its blend of practicality, efficiency, and refinement. It’s often praised for its comfortable ride, spacious interior, and advanced technology. Compared to other A6 variants, the 40 TDI offers a more affordable entry point into the A6 Avant range, while still providing a premium experience. Its fuel economy is a key selling point, particularly in Europe where diesel engines remain popular. Competitors include the BMW 5 Series Touring, Mercedes-Benz E-Class Estate, and Volvo V90.
Legacy
The EA288 engine family, including the version used in the A6 Avant 40 TDI, has proven to be a reliable and durable powertrain. While diesel engines have faced increased scrutiny in recent years, the EA288 has benefited from ongoing development and refinement, addressing previous concerns regarding emissions and reliability. The combination of the engine, S tronic transmission, and quattro ultra system has established a reputation for smooth operation and long-term dependability. In the used car market, well-maintained A6 Avant 40 TDI models are likely to hold their value due to their reputation for quality and practicality.
