The Audi S4 (B9 facelift) 3.0 TDI V6 Mild Hybrid quattro tiptronic represents a compelling blend of performance and efficiency within the executive sedan segment. Introduced in late 2020 as part of the B9 generation’s refresh, this variant was offered through the 2023 model year. It occupies a significant position as the diesel-powered performance option in Audi’s S4 lineup, catering to European markets and regions where diesel fuel remains prevalent. This model combines a potent turbocharged diesel engine with a mild hybrid system and Audi’s renowned quattro all-wheel-drive, packaged with an eight-speed automatic transmission.
Technical Specifications
| Brand | Audi |
| Model | S4 |
| Generation | S4 (B9, facelift 2019) |
| Type (Engine) | 3.0 TDI V6 (341 Hp) Mild Hybrid quattro tiptronic |
| Start of production | November, 2020 |
| End of production | 2023 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Combined fuel consumption (WLTP) | 6.9-7.2 l/100 km (34.1 – 32.7 US mpg) |
| CO2 emissions (WLTP) | 182-190 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 4.6 sec |
| Acceleration 0 – 62 mph | 4.6 sec |
| Acceleration 0 – 60 mph | 4.4 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6d-ISC-FCM |
| Weight-to-power ratio | 5.3 kg/Hp |
| Weight-to-torque ratio | 2.6 kg/Nm |
| Net (usable) 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 | 341 Hp @ 3800-3950 rpm |
| Torque | 700 Nm @ 1750-3250 rpm (516.29 lb.-ft.) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | EA897evo3 / DMKC |
| 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 | 15.5 l (16.38 US qt | 13.64 UK qt) |
| Kerb Weight | 1795 kg (3957.3 lbs) |
| Max. weight | 2325 kg (5125.75 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 | 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 | 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 (Back) 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 (turning diameter) | 11.6 m (38.06 ft) |
| Front suspension | Independent multi-link suspension |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs, 375 mm |
| Rear brakes | Ventilated discs, 330 mm |
| Number of gears and type of gearbox | 8 gears, automatic transmission tiptronic |
INTRODUCTION
The Audi S4 (B9 facelift) 3.0 TDI V6 Mild Hybrid quattro tiptronic, produced from late 2020 to 2023, represents a refined iteration of Audi’s performance-oriented S4 sedan. Built on the 1HX0/A3 platform, this variant was primarily targeted towards European markets where diesel engines continue to hold a strong presence due to their fuel efficiency and torque characteristics. The facelift brought updated styling, enhanced technology, and improvements to the engine and transmission. This particular configuration aimed to deliver a balance between spirited driving dynamics and everyday usability, appealing to buyers seeking a premium sports sedan with lower running costs.
Powertrain & Engine Architecture
At the heart of the S4 TDI is the EA897evo3 3.0-liter V6 diesel engine, designated with the engine code DMKC. This engine utilizes a sophisticated diesel commonrail fuel injection system, delivering precise fuel metering for optimal combustion. The engine features a single turbocharger, augmented by an electric powered compressor (EPC) to mitigate turbo lag and provide instant throttle response. An intercooler further enhances performance by cooling the intake air. The valvetrain employs a dual overhead camshaft (DOHC) design with four valves per cylinder. The mild hybrid system, operating at 48V, incorporates a belt starter generator (BSG) and a small lithium-ion battery. This system enables features like extended engine-off coasting, regenerative braking, and smoother start-stop operation, improving fuel economy. The engine is paired with Audi’s eight-speed tiptronic automatic transmission, known for its quick and smooth shifts. This transmission is specifically tuned to handle the high torque output of the diesel engine.
Driving Characteristics
The 3.0 TDI V6 with the tiptronic transmission delivers a distinctly different driving experience compared to the gasoline-powered S4 variants or even the manual diesel options. The substantial 700 Nm (516 lb-ft) of torque, available from a low 1750 rpm, provides effortless acceleration and strong in-gear performance. While not as explosively quick as the petrol S4, the TDI offers a more relaxed and refined power delivery. The tiptronic transmission, while efficient, may not offer the same level of driver engagement as a manual gearbox. Gear ratios are optimized for both performance and fuel economy, with taller gears for highway cruising and shorter gears for quicker acceleration. The quattro all-wheel-drive system ensures excellent traction in all weather conditions, contributing to confident handling and stability.
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 large touchscreen display with Audi’s MMI interface, providing access to navigation, entertainment, and vehicle settings. Standard safety features included Audi’s pre-sense basic system, lane departure warning, and automatic emergency braking. Optional extras included a Bang & Olufsen sound system, a head-up display, adaptive cruise control, and a panoramic sunroof. The S4 TDI was generally positioned as a mid-to-high-range trim level, offering a premium experience without the full customization options of the top-tier performance models.
Chassis & Braking
The S4 TDI utilizes an independent multi-link suspension setup for both the front and rear axles, providing a comfortable yet controlled ride. The suspension is tuned to balance performance and comfort, offering a good compromise for everyday driving. The car features ventilated disc brakes on all four wheels, with larger discs at the front (375mm) compared to the rear (330mm). The braking system is assisted by ABS (Anti-lock Braking System) and electronic stability control. The chassis is reinforced compared to the standard A4 to handle the increased power and torque. Steering is provided by an electric power steering system, offering precise and responsive control.
Market Reception & Comparison
The Audi S4 3.0 TDI V6 Mild Hybrid quattro tiptronic was generally well-received by automotive critics. It was praised for its strong performance, refined driving experience, and excellent fuel economy. Compared to the gasoline-powered S4, the TDI offered lower running costs and a more relaxed driving style. However, some critics noted that the diesel engine lacked the responsiveness and excitement of the petrol variant. Compared to other diesel-powered performance sedans, such as the BMW 530d, the S4 TDI offered a more luxurious interior and a more sophisticated all-wheel-drive system. Fuel economy figures typically ranged from 6.9 to 7.2 liters per 100 kilometers (34.1 to 32.7 US mpg), making it a relatively efficient performance car.
Legacy
The EA897evo3 diesel engine, in general, has proven to be a reliable and durable powerplant when properly maintained. The mild hybrid system adds a layer of complexity, but has also demonstrated good long-term reliability. The tiptronic transmission is also known for its robustness. In the used car market, the S4 3.0 TDI V6 Mild Hybrid quattro tiptronic represents a compelling value proposition for buyers seeking a high-performance, fuel-efficient sedan. Regular maintenance, including oil changes and adherence to recommended service intervals, is crucial for ensuring the longevity of this powertrain. The combination of performance, luxury, and efficiency has ensured that this variant remains a desirable option for discerning drivers.
