The Audi A4 (B7) 3.0 TDI quattro, produced from August 2004 to 2007, represented a significant step forward in diesel performance for the Audi A4 range. Positioned as a premium offering within the B7 generation (2004-2008), this variant combined a potent 3.0-liter V6 turbodiesel engine with Audi’s renowned quattro all-wheel-drive system. It aimed to deliver a blend of performance, refinement, and all-weather capability, appealing to buyers seeking a more sophisticated driving experience than the entry-level petrol options. The B7 A4 itself was a facelift of the B6 model, featuring revised styling, improved interior materials, and updated technology.
Technical Specifications
| Brand | Audi |
| Model | A4 |
| Generation | A4 (B7 8E) |
| Type (Engine) | 3.0 TDI V6 (204 Hp) quattro |
| Start of production | August, 2004 |
| End of production | 2007 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (economy) – urban | 10.3 l/100 km (22.8 US mpg, 27.4 UK mpg, 9.7 km/l) |
| Fuel consumption (economy) – extra urban | 5.8 l/100 km (40.6 US mpg, 48.7 UK mpg, 17.2 km/l) |
| Fuel consumption (economy) – combined | 8.7 l/100 km (27 US mpg, 32.5 UK mpg, 11.5 km/l) |
| CO2 emissions | 203 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 7.2 sec |
| Acceleration 0 – 62 mph | 7.2 sec |
| Acceleration 0 – 60 mph | 6.8 sec |
| Maximum speed | 235 km/h (146.02 mph) |
| Emission standard | Euro 4 |
| Weight-to-power ratio | 7.9 kg/Hp, 126.7 Hp/tonne |
| Weight-to-torque ratio | 3.6 kg/Nm, 279.5 Nm/tonne |
| Power | 204 Hp @ 3500-4500 rpm |
| Power per litre | 68.8 Hp/l |
| Torque | 450 Nm @ 1400-3150 rpm (331.9 lb.-ft. @ 1400-3150 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | BKN |
| 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 | 17:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 8 l (8.45 US qt | 7.04 UK qt) |
| Coolant | 12 l (12.68 US qt | 10.56 UK qt) |
| Kerb Weight | 1610 kg (3549.44 lbs.) |
| Max. weight | 2160 kg (4761.98 lbs.) |
| Max load | 550 kg (1212.54 lbs.) |
| Trunk (boot) space – minimum | 460 l (16.24 cu. ft.) |
| Trunk (boot) space – maximum | 720 l (25.43 cu. ft.) |
| Fuel tank capacity | 63 l (16.64 US gal | 13.86 UK gal) |
| Max. roof load | 75 kg (165.35 lbs.) |
| Permitted trailer load with brakes (8%) | 2000 kg (4409.25 lbs.) |
| Permitted trailer load with brakes (12%) | 1800 kg (3968.32 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 80 kg (176.37 lbs.) |
| Length | 4548 mm (179.06 in.) |
| Width | 1772 mm (69.76 in.) |
| Width including mirrors | 1937 mm (76.26 in.) |
| Height | 1427 mm (56.18 in.) |
| Wheelbase | 2648 mm (104.25 in.) |
| Front track | 1522 mm (59.92 in.) |
| Rear (Back) track | 1522 mm (59.92 in.) |
| Drag coefficient (Cd) | 0.31 |
| Minimum turning circle (turning diameter) | 11.1 m (36.42 ft.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives permanently the four wheels of the vehicle. |
| 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 multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | 205/55 R16 |
| Wheel rims size | 7J x 16 |
Powertrain & Engine Architecture
The heart of the A4 3.0 TDI quattro is the BKN engine code, a 2,967 cc (181.06 cu. in.) V6 diesel engine. This engine utilized a common rail direct injection system, delivering fuel at extremely high pressure for optimized combustion. The BKN featured a variable geometry turbocharger (VGT) and an intercooler, enhancing both low-end torque and peak power. The engine’s double overhead camshafts (DOHC) operated four valves per cylinder, contributing to its efficient breathing. The engine produced 204 horsepower at 3,500-4,500 rpm and a substantial 450 Nm (331.9 lb-ft) of torque between 1,400 and 3,150 rpm. The six-speed manual transmission was standard, providing precise gear changes and allowing the driver to fully exploit the engine’s powerband.
Driving Characteristics
The 3.0 TDI quattro offered a distinctly different driving experience compared to the smaller displacement petrol engines available in the B7 A4 range. The abundant torque made for effortless cruising and strong acceleration in everyday driving situations. While not a sports car, the 3.0 TDI provided brisk performance, achieving 0-60 mph in around 6.8 seconds. The quattro all-wheel-drive system provided excellent traction, particularly in inclement weather, enhancing stability and confidence. The six-speed manual transmission allowed for precise control, but the gear ratios were geared towards maximizing fuel efficiency and providing a relaxed driving experience rather than outright performance.
Equipment & Trim Levels
The 3.0 TDI quattro typically came well-equipped, reflecting its position as a premium variant. Standard features often included automatic climate control, power windows and mirrors, a multi-function steering wheel, and a high-quality audio system. Interior upholstery was typically a combination of cloth and leather, with options for full leather trim. Optional extras included sunroof, navigation system, heated seats, and parking sensors. The B7 A4 offered various trim packages, allowing buyers to customize their vehicle with additional features and aesthetic enhancements.
Chassis & Braking
The A4 B7 3.0 TDI quattro utilized an independent multi-link suspension system at both the front and rear, providing a comfortable ride and precise handling. The front suspension featured coil springs and stabilizer bar, while the rear suspension employed separate springs and dampers. Braking duties were handled by ventilated discs at the front and solid discs at the rear, assisted by an Anti-lock Braking System (ABS). The quattro system distributed power between the front and rear axles as needed, optimizing traction and stability.
Market Reception & Comparison
The Audi A4 3.0 TDI quattro was generally well-received by automotive critics. It was praised for its refined engine, strong performance, and all-weather capability. Compared to the 1.8T petrol variants, the 3.0 TDI offered significantly more torque and better fuel economy. However, it came at a higher price point. Compared to other diesel-powered competitors like the BMW 330d, the A4 3.0 TDI was often seen as offering a more comfortable ride and a more luxurious interior. Fuel economy was a strong point, achieving around 27 US mpg in combined driving, making it an attractive option for those covering long distances.
Legacy
The BKN engine, while generally reliable, is known to require regular maintenance, particularly regarding the diesel particulate filter (DPF) and turbocharger. Proper oil changes and the use of high-quality fuel are crucial for long-term reliability. Today, the B7 A4 3.0 TDI quattro represents a compelling option in the used car market for those seeking a capable and refined all-wheel-drive sedan. Its robust engine and well-built chassis ensure it remains a viable option for many years to come, provided it has been well-maintained. The combination of performance, practicality, and all-weather capability continues to appeal to enthusiasts and everyday drivers alike.
