The Audi S4 (B9, facelift) 3.0 TDI V6 (347 hp) Mild Hybrid quattro tiptronic represents a compelling blend of performance and efficiency within the broader B9 S4 generation, produced from 2019 through June 2020. Positioned as a premium offering, this variant catered to buyers seeking the sporting character of the S4 with the refinement and fuel economy benefits of a diesel engine and mild hybrid technology. It occupied a space between the gasoline-powered S4 variants and the more economy-focused TDI models with lower power outputs. This model was primarily sold in the European market, where diesel engines remained popular due to favorable taxation and fuel efficiency regulations.
Technical Specifications
| Brand | Audi |
| Model | S4 |
| Generation | S4 (B9, facelift) |
| Type (Engine) | 3.0 TDI V6 (347 Hp) Mild Hybrid quattro tiptronic |
| Start of production | 2019 |
| End of production | June, 2020 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Combined fuel consumption (WLTP) | 6.9-7.1 l/100 km (34.1 – 33.1 US mpg) |
| CO2 emissions (WLTP) | 179-186 g/km |
| 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 (NEDC) | 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-TEMP-EVAP-ISC |
| Weight-to-power ratio | 5.1 kg/Hp |
| Weight-to-torque ratio | 2.6 kg/Nm |
| Net battery capacity | 0.5 kWh |
| Battery voltage | 48 V |
| Battery technology | Lithium-ion (Li-Ion) |
| Battery weight | 10 kg (22.05 lbs) |
| Battery location | Under the trunk |
| 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 capacity | 11.5 l (12.15 US qt | 10.12 UK qt) |
| Kerb Weight | 1785 kg (3935.25 lbs) |
| Max. weight | 2315 kg (5103.7 lbs) |
| Max load | 530 kg (1168.45 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 capacity | 12 l (3.17 US gal | 2.64 UK gal) |
| Max. roof load | 90 kg (198.42 lbs) |
| Permitted trailer load (brakes 8%) | 2100 kg (4629.71 lbs) |
| Permitted trailer load (brakes 12%) | 1900 kg (4188.78 lbs) |
| Permitted trailer load (no brakes) | 750 kg (1653.47 lbs) |
| Permitted towbar download | 80 kg (176.37 lbs) |
| Length | 4770 mm (187.8 in.) |
| Width | 1847 mm (72.72 in.) |
| Width including mirrors | 2022 mm (79.61 in.) |
| Height | 1404 mm (55.28 in.) |
| Wheelbase | 2825 mm (111.22 in.) |
| Front track | 1565 mm (61.61 in.) |
| Rear track | 1546 mm (60.87 in.) |
| Front overhang | 906 mm (35.67 in.) |
| Rear overhang | 1039 mm (40.91 in.) |
| Drag coefficient (Cd) | 0.28 |
| Minimum turning circle | 11.9 m (39.04 ft) |
| Drivetrain Architecture | ICE and electric motor drive all four wheels |
| Drive wheel | 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 |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 245/40 R18 |
| Wheel rims size | 8J x 18 |
INTRODUCTION
The Audi S4 (B9 facelift) 3.0 TDI V6 Mild Hybrid quattro tiptronic, launched in 2019, represents a mid-cycle refresh of the B9 S4 platform. Building upon the foundation laid by the initial B9 release, this variant offered a sophisticated diesel powertrain combined with a 48-volt mild hybrid system. This combination aimed to deliver the performance expected of the S4 badge while improving fuel efficiency and reducing emissions. The facelift brought subtle styling updates, enhanced technology, and refined engine options, solidifying the S4’s position as a premium sport sedan in the European market.
Powertrain & Engine Architecture
At the heart of this S4 variant lies the EA897evo2 3.0-liter V6 TDI engine, designated with the code DEWB. This engine is a turbocharged diesel featuring common-rail direct injection and a sophisticated valvetrain. The addition of an electric powered compressor (EPC) alongside the conventional turbocharger significantly reduces turbo lag, providing more immediate throttle response. The mild hybrid system, operating at 48 volts, utilizes a belt starter generator (BSG) and a small lithium-ion battery (0.5 kWh) to enable features like extended start-stop operation, coasting with engine off, and a limited amount of regenerative braking (up to 8 kW). The eight-speed tiptronic automatic transmission, known for its smooth and quick shifts, is standard. This transmission is specifically tuned to complement the engine’s torque characteristics, offering both efficient cruising and responsive acceleration.
Driving Characteristics
The 347 hp and 700 Nm (516 lb-ft) of torque delivered by the 3.0 TDI engine provide strong acceleration. The 0-60 mph sprint is achieved in approximately 4.6 seconds, making it a genuinely quick vehicle. The mild hybrid system contributes to a seamless driving experience, masking the shift points of the automatic transmission and providing a boost during acceleration. Compared to the gasoline-powered S4 variants, the TDI offers a more relaxed and torquey power delivery, making it well-suited for long-distance driving. While not as outright sporty as the higher-revving gasoline engines, the TDI provides ample power for overtaking and spirited driving. The quattro all-wheel-drive system ensures excellent traction in all weather conditions.
Equipment & Trim Levels
The S4 3.0 TDI Mild Hybrid typically came well-equipped as standard. Features included Audi’s virtual cockpit digital instrument cluster, a premium sound system, leather upholstery, three-zone automatic climate control, and a suite of driver-assistance systems such as adaptive cruise control and lane-keeping assist. Optional extras included a panoramic sunroof, upgraded leather packages, and various styling enhancements. The interior design featured S-specific badging and sporty accents, differentiating it from the standard A4 models.
Chassis & Braking
The S4 chassis features a sport-tuned suspension, lowering the ride height compared to the A4. The front suspension utilizes independent multi-link design, while the rear also employs a multi-link setup. Ventilated disc brakes are fitted on all four wheels, providing ample stopping power. The steering is a speed-sensitive electric power steering system, offering precise and responsive handling. Stabilizer bars are thicker than those found on the standard A4, further reducing body roll during cornering.
Market Reception & Comparison
The S4 3.0 TDI Mild Hybrid was generally well-received by automotive critics. It was praised for its blend of performance, efficiency, and refinement. Compared to the gasoline-powered S4 variants, the TDI offered superior fuel economy, making it a more practical choice for drivers covering long distances. However, some critics noted that the diesel engine lacked the responsiveness and aural excitement of the gasoline engines. Against other TDI-powered performance cars, the S4 stood out for its sophisticated technology, luxurious interior, and all-wheel-drive capability.
Legacy
The Audi S4 (B9 facelift) 3.0 TDI V6 Mild Hybrid represents a significant step in the evolution of performance diesels. The combination of turbocharging, mild hybrid technology, and quattro all-wheel drive delivers a compelling driving experience. While diesel engines have faced increasing scrutiny in recent years, the EA897evo2 engine is known for its reliability and durability. On the used car market, these S4 variants hold their value well, appealing to buyers seeking a refined and efficient performance sedan. The mild hybrid system, while not a full hybrid, demonstrates Audi’s commitment to improving fuel economy and reducing emissions.
