The Audi S4 Avant (B9) 3.0 TDI V6, produced for the 2019 model year, represents a compelling blend of performance and practicality within the Audi S4 lineup. Positioned as a premium offering, this variant combined a potent diesel engine with a sophisticated mild-hybrid system and Audi’s renowned quattro all-wheel drive. It served as a flagship estate car, appealing to buyers seeking a high-performance vehicle capable of long-distance travel and everyday utility. This specific configuration was primarily sold in European markets where diesel engines remained popular due to fuel efficiency and torque characteristics.
Technical Specifications
| Brand | Audi |
| Model | S4 |
| Generation | S4 Avant (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 | Station wagon (estate) |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 7.2 l/100 km (32.7 US mpg) |
| Fuel consumption (extra urban) | 5.7-5.8 l/100 km (41.3 – 40.6 US mpg) |
| Fuel consumption (combined) | 6.3 l/100 km (37.3 US mpg) |
| CO2 emissions | 164-165 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 4.9 sec |
| Acceleration 0 – 62 mph | 4.9 sec |
| Acceleration 0 – 60 mph | 4.7 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6d |
| Weight-to-power ratio | 5.2 kg/Hp |
| Weight-to-torque ratio | 2.6 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 capacity | 11.5 l (12.15 US qt | 10.12 UK qt) |
| Kerb Weight | 1820 kg (4012.41 lbs.) |
| Max. weight | 2375 kg (5235.98 lbs.) |
| Max load | 555 kg (1223.57 lbs.) |
| Trunk (boot) space – minimum | 420 l (14.83 cu. ft.) |
| Trunk (boot) space – maximum | 1435 l (50.68 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 with brakes (8%) | 2100 kg (4629.71 lbs.) |
| Permitted trailer load with brakes (12%) | 1900 kg (4188.78 lbs.) |
| Permitted trailer load without brakes | 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 | 1437 mm (56.57 in.) |
| Wheelbase | 2825 mm (111.22 in.) |
| Front track | 1565 mm (61.61 in.) |
| Rear track | 1546 mm (60.87 in.) |
| Drag coefficient (Cd) | 0.31 |
| 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
At the heart of the S4 Avant (B9) 3.0 TDI lies the EA897evo2 engine, a 3.0-liter V6 diesel. This engine, designated with the code DEWB, benefits from advanced technologies like a turbocharger and an electric powered compressor (EPC) working in tandem to minimize turbo lag and deliver instant response. The engine utilizes a diesel commonrail fuel injection system, ensuring precise fuel delivery for optimal combustion. The 15.5:1 compression ratio contributes to the engine’s efficiency. The mild-hybrid system, operating at 48V, incorporates a belt starter generator (BSG) and a small lithium-ion battery located under the trunk floor. This system enables features like extended start-stop operation, coasting with engine shut-off, and a limited amount of regenerative braking (8kW), improving fuel economy. The engine is paired with an eight-speed tiptronic automatic transmission, known for its smooth shifts and quick response. The transmission is calibrated to work seamlessly with the engine’s torque curve and the quattro all-wheel-drive system.
Driving Characteristics
The 347 horsepower and 700 Nm (516 lb-ft) of torque produced by this engine configuration translate into brisk acceleration. The 0-60 mph sprint takes approximately 4.7 seconds, and the car is electronically limited to a top speed of 250 km/h (155 mph). The mild-hybrid system enhances the driving experience by providing a subtle power boost during acceleration. The eight-speed tiptronic transmission offers both automatic and manual shift modes, allowing drivers to tailor the driving experience to their preferences. Compared to the gasoline-powered S4 variants, the TDI offers superior fuel economy and a broader, more accessible torque curve. However, it lacks the high-revving excitement of the petrol engines. The quattro all-wheel-drive system provides excellent traction and stability in all weather conditions, making the S4 Avant a capable and confident performer year-round.
Equipment & Trim Levels
The S4 Avant (B9) 3.0 TDI typically came well-equipped as standard. Features included sport seats upholstered in a combination of Alcantara and leather, a flat-bottomed steering wheel, stainless steel pedal caps, and S-specific exterior styling cues. The infotainment system featured a high-resolution touchscreen display with navigation, Apple CarPlay, and Android Auto compatibility. Optional extras included a Bang & Olufsen sound system, a head-up display, adaptive cruise control, and a panoramic sunroof. Interior trim options included carbon fiber, wood, and aluminum accents.
Chassis & Braking
The S4 Avant features a sophisticated chassis designed to deliver a balance of comfort and handling. The suspension utilizes independent multi-link setups at both the front and rear, providing precise wheel control and a smooth ride. The standard suspension setup offered a sporty but compliant ride. Optional sport suspension packages were available, offering a firmer ride and even more precise handling. The braking system consists of ventilated discs at all four corners, providing ample stopping power. Audi’s ABS (Anti-lock Braking System) and electronic stability control systems further enhance safety and control.
Market Reception & Comparison
The S4 Avant (B9) 3.0 TDI was generally well-received by automotive critics. It was praised for its powerful engine, refined ride, and practical estate car body style. Fuel economy was a significant selling point, particularly in Europe. Compared to the gasoline-powered S4 Avant, the TDI offered better fuel efficiency and a more relaxed driving experience. However, some critics noted that the diesel engine lacked the responsiveness and sound of the petrol engines. Against competitors like the BMW 3 Series Touring and Mercedes-Benz C-Class Estate, the S4 Avant offered a compelling combination of performance, luxury, and practicality.
Legacy
The EA897evo2 engine family, including the DEWB variant, has proven to be relatively reliable. With proper maintenance, these engines can accumulate high mileage without major issues. The mild-hybrid system has also demonstrated good durability. In the used car market, the S4 Avant (B9) 3.0 TDI remains a desirable option for buyers seeking a high-performance estate car. However, potential buyers should be aware of the potential costs associated with diesel particulate filter (DPF) maintenance and AdBlue refills. Overall, this variant represents a well-engineered and capable vehicle that continues to offer a compelling blend of performance, efficiency, and practicality.
