The Audi S4 (B9) 3.0 TDI V6, produced for the 2019 model year, represents a compelling blend of performance and efficiency within the broader B9 S4 generation (2017-2023). This variant, equipped with a 3.0-liter turbocharged diesel V6 engine and a mild-hybrid system, was primarily marketed in Europe and other regions where diesel engines remain popular. It occupied a position as a high-performance, yet relatively economical, option within the S4 lineup, slotting between the standard gasoline-powered models and the more focused, track-oriented RS 4. The B9 S4 utilized Audi’s MLB Evo platform, shared with other Volkswagen Group vehicles, offering a sophisticated chassis and advanced technology.
Technical Specifications
| Brand | Audi |
| Model | S4 |
| Generation | S4 (B9) |
| Type (Engine) | 3.0 TDI V6 (347 Hp) Mild Hybrid quattro tiptronic |
| Start of production | 2019 |
| End of production | 2019 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 7.2 l/100 km (32.7 US mpg) |
| Fuel consumption (extra urban) | 5.6 l/100 km (42 US mpg) |
| Fuel consumption (combined) | 6.2 l/100 km (37.9 US mpg) |
| CO2 emissions | 161-163 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 4.8 sec |
| Acceleration 0 – 62 mph | 4.8 sec |
| Acceleration 0 – 60 mph | 4.6 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6d |
| Weight-to-power ratio | 5.1 kg/Hp |
| Weight-to-torque ratio | 2.5 kg/Nm |
| Gross battery capacity | 0.5 kWh |
| Battery voltage | 48 V |
| Battery technology | Lithium-ion (Li-Ion) |
| Recuperation output | 8 kW |
| Power | 347 Hp @ 3850 rpm |
| Torque | 700 Nm @ 2500-3100 rpm (516.29 lb.-ft.) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | EA897evo2 / DEWB |
| 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 | 11.5 l (12.15 US qt | 10.12 UK qt) |
| Kerb Weight | 1780 kg (3924.23 lbs.) |
| Max. weight | 2315 kg (5103.7 lbs.) |
| Max load | 535 kg (1179.47 lbs.) |
| Trunk (boot) space (minimum) | 420 l (14.83 cu. ft.) |
| Fuel tank capacity | 58 l (15.32 US gal | 12.76 UK gal) |
| AdBlue tank | 12 l (3.17 US gal | 2.64 UK gal) |
| Max. roof load | 90 kg (198.42 lbs.) |
| Permitted trailer load (8%) | 2100 kg (4629.71 lbs.) |
| Permitted trailer load (12%) | 1900 kg (4188.78 lbs.) |
| Permitted trailer load (unbraked) | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 80 kg (176.37 lbs.) |
| Length | 4750 mm (187.01 in.) |
| Width | 1842 mm (72.52 in.) |
| Width (including mirrors) | 2022 mm (79.61 in.) |
| Height | 1407 mm (55.39 in.) |
| Wheelbase | 2825 mm (111.22 in.) |
| Front track | 1565 mm (61.61 in.) |
| Rear track | 1546 mm (60.87 in.) |
| Drag coefficient (Cd) | 0.28 |
| Minimum turning circle | 11.6 m (38.06 ft.) |
| Drivetrain | All wheel drive (4×4) |
| Number of gears | 8 |
| Gearbox type | Automatic transmission tiptronic |
| Front suspension | Independent multi-link suspension |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Tires size | 245/40 R18 |
| Wheel rims size | 8J x 18 |
Powertrain & Engine Architecture
The heart of the S4 3.0 TDI is the EA897evo2 engine, a 3.0-liter V6 diesel. This engine utilizes a sophisticated common-rail direct injection system, delivering fuel at extremely high pressures for optimized combustion. A single turbocharger, coupled with an electric powered compressor (EPC), minimizes turbo lag and provides a broad torque curve. The EPC spools up quickly at low engine speeds, supplementing the turbocharger until it reaches full boost. The mild-hybrid system, employing a 48V lithium-ion battery and a belt-driven starter-generator, enables features like extended start-stop operation, coasting with the engine off, and a small power boost during acceleration. The eight-speed tiptronic automatic transmission is standard, offering smooth and quick shifts. It’s designed to handle the engine’s substantial 700 Nm (516 lb-ft) of torque.
Driving Characteristics
The 3.0 TDI S4 delivers a distinctly different driving experience compared to the gasoline-powered S4 variants. While lacking the high-revving excitement of the TFSI engines, the TDI offers prodigious low-end and mid-range torque. This translates to effortless acceleration in everyday driving situations and strong performance when overtaking. The tiptronic transmission is well-tuned, providing responsive shifts, although some enthusiasts prefer the engagement of a manual gearbox. The quattro all-wheel-drive system ensures excellent traction in all weather conditions. The mild-hybrid system contributes to improved fuel economy without significantly impacting performance. Compared to the higher-output gasoline S4, the TDI prioritizes efficiency and usability over outright speed.
Equipment & Trim Levels
The S4 3.0 TDI typically came well-equipped as standard. Interior features included sport seats upholstered in a combination of leather and Alcantara, a flat-bottomed steering wheel, and aluminum trim accents. The infotainment system featured a high-resolution touchscreen display with Audi’s MMI interface. Standard safety features included Audi’s side assist, rear cross-traffic alert, and a suite of airbags. Optional extras included a Bang & Olufsen sound system, a panoramic sunroof, and adaptive cruise control. Trim levels were often region-specific, but generally offered packages that added features like upgraded leather upholstery, carbon fiber trim, and advanced driver-assistance systems.
Chassis & Braking
The B9 S4 features a sophisticated chassis designed for both comfort and handling. Independent multi-link suspension is used at both the front and rear, providing a smooth ride and precise control. The suspension is typically tuned to be slightly firmer than the standard A4, offering a more engaging driving experience. Brakes consist of ventilated discs at all four corners, providing ample stopping power. The electronic stability control (ESC) system is finely tuned to work in conjunction with the quattro all-wheel-drive system, enhancing stability and traction.
Market Reception & Comparison
The S4 3.0 TDI was generally well-received by automotive critics, praised for its strong performance, excellent fuel economy, and refined driving experience. It was often seen as a practical and sensible choice for those seeking a high-performance sedan without the running costs associated with gasoline engines. Compared to the gasoline-powered S4, the TDI offered superior fuel economy but slightly less outright acceleration. Against competitors like the BMW 530d and Mercedes-Benz E350d, the S4 TDI held its own, offering a compelling combination of performance, luxury, and technology.
Legacy
The EA897evo2 engine, in its various iterations, has proven to be a robust and reliable powerplant. The 3.0 TDI variant in the S4 is generally considered to be a durable engine, provided it receives regular maintenance. Common issues, if any, often relate to the diesel particulate filter (DPF) and the AdBlue system, particularly on vehicles that are primarily driven on short trips. On the used car market, the S4 3.0 TDI represents a good value proposition, offering a high level of performance and refinement at a relatively affordable price. Its fuel efficiency and long-term reliability make it an attractive option for buyers seeking a practical and enjoyable performance sedan.
