The Audi S4 Avant (8E, B6) 4.2i V8 quattro, produced from March 2003 to December 2004, represents a high-performance iteration of the B6 generation Audi A4 Avant. Positioned as the flagship wagon within the A4 family, the S4 Avant combined the practicality of a station wagon with the potent performance of Audi’s naturally aspirated 4.2-liter V8 engine and quattro all-wheel drive. This model aimed to deliver a compelling blend of everyday usability and exhilarating driving dynamics, appealing to enthusiasts seeking a versatile performance vehicle. It was a key offering in Audi’s strategy to broaden the appeal of its ‘S’ performance line beyond traditional coupe and sedan body styles.
Technical Specifications
| Brand | Audi |
| Model | S4 |
| Generation | S4 Avant (8E,B6) |
| Type (Engine) | 4.2i V8 (344 Hp) quattro |
| Start of production | March, 2003 |
| End of production | December, 2004 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Station wagon (estate) |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (economy) – urban | 19.6 l/100 km (12 US mpg, 14.4 UK mpg, 5.1 km/l) |
| Fuel consumption (economy) – extra urban | 9.8 l/100 km (24 US mpg, 28.8 UK mpg, 10.2 km/l) |
| Fuel consumption (economy) – combined | 13.4 l/100 km (17.6 US mpg, 21.1 UK mpg, 7.5 km/l) |
| CO2 emissions | 322 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 5.8 sec |
| Acceleration 0 – 62 mph | 5.8 sec |
| Acceleration 0 – 60 mph | 5.5 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Weight-to-power ratio | 5 kg/Hp, 200 Hp/tonne |
| Weight-to-torque ratio | 4.2 kg/Nm, 238.4 Nm/tonne |
| Power | 344 Hp @ 7000 rpm |
| Power per litre | 82.6 Hp/l |
| Torque | 410 Nm @ 3500 rpm (302.4 lb.-ft. @ 3500 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | BBK |
| Engine displacement | 4163 cm3 (254.04 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 84.5 mm (3.33 in.) |
| Piston Stroke | 92.8 mm (3.65 in.) |
| Compression ratio | 11:1 |
| Number of valves per cylinder | 5 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC |
| Engine oil capacity | 9 l (9.51 US qt | 7.92 UK qt) |
| Coolant | 12 l (12.68 US qt | 10.56 UK qt) |
| Kerb Weight | 1720 kg (3791.95 lbs.) |
| Max. weight | 2270 kg (5004.49 lbs.) |
| Max load | 550 kg (1212.54 lbs.) |
| Trunk (boot) space – minimum | 442 l (15.61 cu. ft.) |
| Trunk (boot) space – maximum | 1184 l (41.81 cu. ft.) |
| Fuel tank capacity | 66 l (17.44 US gal | 14.52 UK gal) |
| Max. roof load | 75 kg (165.35 lbs.) |
| Length | 4575 mm (180.12 in.) |
| Width | 1781 mm (70.12 in.) |
| Height | 1440 mm (56.69 in.) |
| Wheelbase | 2651 mm (104.37 in.) |
| Front track | 1516 mm (59.69 in.) |
| Rear (Back) track | 1512 mm (59.53 in.) |
| Drag coefficient (Cd) | 0.31 |
| Minimum turning circle (turning diameter) | 11.5 m (37.73 ft.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 6 gears, manual transmission |
| Front suspension | Independent multi-link suspension |
| Rear suspension | Independent on trapezoidal lever |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | 235/40 R18 |
| Wheel rims size | 8J x 18 |
Powertrain & Engine Architecture
The heart of the S4 Avant is the BBK engine, a 4.2-liter naturally aspirated V8. This engine, a descendant of the unit used in the Audi RS4, features a 90-degree V-angle and utilizes an aluminum alloy block and cylinder heads. It employs multi-port fuel injection and a double overhead camshaft (DOHC) valvetrain with five valves per cylinder (four intake, one exhaust). This configuration contributes to a broad torque curve and a responsive power delivery. The engine produces 344 horsepower at 7000 rpm and 302 lb-ft of torque at 3500 rpm. The standard transmission for the S4 Avant 4.2i was a six-speed manual gearbox. The quattro all-wheel drive system, a hallmark of Audi performance models, distributes power between the front and rear axles based on traction conditions, enhancing stability and grip.
Driving Characteristics
The S4 Avant 4.2i offered a distinctly engaging driving experience. The naturally aspirated V8 provided linear and predictable power delivery, unlike the more abrupt response of turbocharged engines. The six-speed manual transmission allowed for precise control, while the quattro system ensured confident handling in various conditions. Acceleration from 0 to 60 mph was achieved in approximately 5.5 seconds, and the car could reach a top speed of 155 mph (electronically limited). Compared to the standard A4 Avant, the S4 Avant offered significantly improved acceleration and handling. While not as overtly aggressive as some of its rear-wheel-drive competitors, the S4 Avant provided a balanced and refined performance experience suitable for both spirited driving and everyday use.
Equipment & Trim Levels
The S4 Avant came well-equipped as standard. Interior features typically included sport seats upholstered in a combination of leather and Alcantara, a leather-wrapped steering wheel and shift knob, and aluminum trim accents. Standard exterior features included a unique S4 body kit, including front and rear spoilers, side skirts, and a quad exhaust system. Optional extras included a sunroof, navigation system, premium sound system, and heated front seats. The S4 Avant was positioned as a premium offering within the A4 range, and its price reflected this.
Chassis & Braking
The S4 Avant featured a sport-tuned suspension with stiffer springs and dampers compared to the standard A4 Avant. The front suspension utilized independent multi-link technology, while the rear suspension employed an independent trapezoidal link setup. This configuration provided a good balance between ride comfort and handling precision. Braking duties were handled by ventilated disc brakes on all four wheels, providing ample stopping power. The anti-lock braking system (ABS) was standard, enhancing safety and control during hard braking.
Market Reception & Comparison
The S4 Avant was generally well-received by automotive critics. It was praised for its potent engine, capable handling, and practical wagon body style. However, some critics noted its relatively high fuel consumption and price. Compared to other performance wagons of the time, such as the BMW 3 Series Touring and the Mercedes-Benz C-Class Estate, the S4 Avant offered a unique combination of performance, practicality, and all-wheel-drive grip. The 1.8T and 3.0L V6 A4 Avants offered significantly lower performance and were targeted at a more budget-conscious buyer. The higher-performance RS4 Avant, while offering even greater performance, came at a substantial price premium.
Legacy
The Audi S4 Avant (8E, B6) 4.2i V8 quattro has become a sought-after vehicle among enthusiasts. The BBK V8 engine is known for its reliability and durability, although regular maintenance is essential. The quattro all-wheel-drive system remains a key selling point, particularly in regions with inclement weather. Today, well-maintained examples of the S4 Avant command a premium in the used car market, appealing to those seeking a unique and capable performance wagon. While fuel economy isn’t a strong suit, the driving experience and overall build quality continue to make it a desirable choice for many.
