The Audi A4 Avant (B9 8W) 40 TDI S tronic, produced from 2018 to 2019, represents a significant iteration of Audi’s popular compact executive estate. This variant, part of the B9 generation’s facelift, positioned itself as a compelling blend of performance, efficiency, and practicality within the A4 Avant lineup. It catered to buyers seeking a diesel-powered wagon with a sophisticated dual-clutch transmission, offering a step up in power and refinement compared to lower-spec models while remaining more accessible than the performance-oriented S4. The “40 TDI” designation reflects Audi’s power-based naming scheme, indicating a model with approximately 190 horsepower.
Technical Specifications
| Brand | Audi |
| Model | A4 |
| Generation | A4 Avant (B9 8W, facelift 2018) |
| Type (Engine) | 40 TDI (190 Hp) S tronic |
| Start of production | 2018 |
| End of production | 2019 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Station wagon (estate) |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 4.9-5.1 l/100 km (48 – 46.1 US mpg, 57.6 – 55.4 UK mpg, 20.4 – 19.6 km/l) |
| Fuel consumption (extra urban) | 4.1-4.3 l/100 km (57.4 – 54.7 US mpg, 68.9 – 65.7 UK mpg, 24.4 – 23.3 km/l) |
| Fuel consumption (combined) | 4.4-4.6 l/100 km (53.5 – 51.1 US mpg, 64.2 – 61.4 UK mpg, 22.7 – 21.7 km/l) |
| CO2 emissions | 115-121 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 7.9 sec |
| Acceleration 0 – 62 mph | 7.9 sec |
| Acceleration 0 – 60 mph | 7.5 sec |
| Maximum speed | 231 km/h (143.54 mph) |
| Emission standard | Euro 6d – TEMP |
| Weight-to-power ratio | 8.1 kg/Hp, 124.2 Hp/tonne |
| Weight-to-torque ratio | 3.8 kg/Nm, 261.4 Nm/tonne |
| Power | 190 Hp @ 3800-4200 rpm |
| Torque | 400 Nm @ 1750-3000 rpm (295.02 lb.-ft. @ 1750-3000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | DESA, DETA |
| Engine displacement | 1968 cm3 (120.09 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Engine oil capacity | 4.7 l (4.97 US qt | 4.14 UK qt) |
| Kerb Weight | 1530 kg (3373.07 lbs.) |
| Max. weight | 2160 kg (4761.98 lbs.) |
| Max load | 630 kg (1388.91 lbs.) |
| Trunk (boot) space – minimum | 495 l (17.48 cu. ft.) |
| Fuel tank capacity | 40 l (10.57 US gal | 8.8 UK gal) |
| Max. roof load | 90 kg (198.42 lbs.) |
| Permitted trailer load with brakes (8%) | 1900 kg (4188.78 lbs.) |
| Permitted trailer load with brakes (12%) | 1700 kg (3747.86 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 80 kg (176.37 lbs.) |
| Length | 4738 mm (186.54 in.) |
| Width | 1842 mm (72.52 in.) |
| Width including mirrors | 2022 mm (79.61 in.) |
| Height | 1435 mm (56.5 in.) |
| Wheelbase | 2820 mm (111.02 in.) |
| Front track | 1572 mm (61.89 in.) |
| Rear (Back) track | 1555 mm (61.22 in.) |
| Front overhang | 880 mm (34.65 in.) |
| Rear overhang | 1038 mm (40.87 in.) |
| Minimum turning circle | 11.6 m (38.06 ft.) |
| Drivetrain Architecture | Front wheel drive |
| Number of gears and type of gearbox | 7 gears, automatic transmission S tronic |
| Front suspension | Independent multi-link suspension |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
Powertrain & Engine Architecture
The 40 TDI variant utilizes a 2.0-liter inline-four cylinder diesel engine, specifically the DESA or DETA engine codes depending on minor production variations. This engine is a member of the Volkswagen Group’s modular engine family, known for its robust construction and efficiency. It employs a common rail direct injection system, delivering fuel at extremely high pressures for optimized combustion. A turbocharger with an intercooler is standard, providing increased air density and boosting power output. The engine produces 190 horsepower at 3800-4200 rpm and a substantial 400 Nm (295 lb-ft) of torque between 1750 and 3000 rpm. This broad torque curve is a hallmark of modern diesel engines, providing strong pulling power across a wide range of engine speeds.
The “S tronic” transmission is a seven-speed dual-clutch transmission (DCT). This transmission offers rapid, seamless gear changes and contributes to the car’s overall efficiency. Unlike a traditional automatic transmission with a torque converter, the S tronic uses two separate clutches – one for odd-numbered gears and one for even-numbered gears – allowing for pre-selection of the next gear and virtually eliminating interruption in power delivery.
Driving Characteristics
The A4 Avant 40 TDI S tronic delivers a refined and capable driving experience. The engine’s ample torque provides brisk acceleration, with a 0-60 mph time of around 7.5 seconds. The S tronic transmission enhances this performance with its quick shifts. While not as overtly sporty as higher-powered A4 variants, the 40 TDI offers a comfortable and confident feel for everyday driving and long-distance journeys. The gear ratios are tuned for a balance between fuel economy and responsiveness. Compared to the manual transmission versions of the same engine, the S tronic provides smoother shifts and reduces driver fatigue, but some enthusiasts may prefer the greater control offered by a manual gearbox.
Equipment & Trim Levels
The 40 TDI S tronic typically came well-equipped as standard. Common features included Audi’s MMI infotainment system with a 7-inch display (larger screens were optional), three-zone automatic climate control, leather upholstery, and a suite of driver-assistance systems such as lane departure warning and automatic emergency braking. Optional extras included a virtual cockpit (a fully digital instrument cluster), a Bang & Olufsen sound system, and adaptive cruise control. Trim levels varied by market, but generally offered progressive upgrades in terms of interior materials, exterior styling, and technology features.
Chassis & Braking
The A4 Avant features a sophisticated chassis design with independent multi-link suspension at both the front and rear. This setup provides a comfortable ride quality while maintaining good handling characteristics. The 40 TDI variant typically came equipped with ventilated disc brakes on all four wheels, providing ample stopping power. Electronic stability control (ESC) and anti-lock braking system (ABS) were standard safety features.
Market Reception & Comparison
The A4 Avant 40 TDI S tronic was generally well-received by automotive critics. It was praised for its refined engine, smooth transmission, and practical estate car body style. Fuel economy was a strong point, with combined figures averaging around 50 mpg. Compared to the more powerful A4 45 TFSI models, the 40 TDI offered a more affordable entry point into the A4 Avant range, while still providing a satisfying driving experience. The 40 TDI also offered better fuel economy than the petrol-powered variants. Reliability was generally good, although, like all modern diesel engines, it was susceptible to issues with the diesel particulate filter (DPF) if not driven on longer journeys regularly.
Legacy
The Audi A4 Avant 40 TDI S tronic remains a popular choice in the used car market. Its combination of practicality, efficiency, and refinement continues to appeal to buyers. The 2.0-liter TDI engine, when properly maintained, is known for its durability. However, potential buyers should be aware of the potential for DPF issues and ensure that the car has a full service history. The S tronic transmission is generally reliable, but regular fluid changes are essential to prevent premature wear. Overall, the A4 Avant 40 TDI S tronic represents a well-rounded and dependable compact executive estate car.
