The Audi A4 Cabriolet (B6 8H) 2.5 TDI V6 with the Multitronic transmission, produced from July 2002 to 2005, represented a compelling blend of open-air motoring and diesel efficiency within the Audi lineup. Positioned as a mid-range offering in the B6 Cabriolet series, it slotted between the more affordable 1.8T petrol models and the higher-performance 3.0 V6 variants. This variant was primarily aimed at European markets where diesel engines were – and continue to be – highly favored for their fuel economy and torque characteristics. The B6 generation A4 Cabriolet, built on the Volkswagen Group’s PL45 (1HX0/A3) platform, offered a more refined and spacious alternative to its predecessor, the B5.
Technical Specifications
| Brand | Audi |
| Model | A4 |
| Generation | A4 Cabriolet (B6 8H) |
| Type (Engine) | 2.5 TDI V6 (163 Hp) Multitronic |
| Start of production | July, 2002 |
| End of production | 2005 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Cabriolet |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 9.4 l/100 km (25 US mpg, 30.1 UK mpg, 10.6 km/l) |
| Fuel consumption (extra urban) | 6 l/100 km (39.2 US mpg, 47.1 UK mpg, 16.7 km/l) |
| Fuel consumption (combined) | 7.2 l/100 km (32.7 US mpg, 39.2 UK mpg, 13.9 km/l) |
| CO2 emissions | 194 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 9.9 sec |
| Acceleration 0 – 62 mph | 9.9 sec |
| Acceleration 0 – 60 mph | 9.4 sec |
| Maximum speed | 217 km/h (134.84 mph) |
| Emission standard | Euro 4 |
| Weight-to-power ratio | 10.6 kg/Hp, 94.8 Hp/tonne |
| Weight-to-torque ratio | 5.5 kg/Nm, 180.2 Nm/tonne |
| Power | 163 Hp @ 4000 rpm |
| Power per litre | 65.3 Hp/l |
| Torque | 310 Nm @ 1400-3600 rpm (228.64 lb.-ft. @ 1400-3600 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | BDG, BFC |
| Engine displacement | 2496 cm3 (152.32 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | V-engine |
| Cylinder Bore | 78.3 mm (3.08 in.) |
| Piston Stroke | 86.4 mm (3.4 in.) |
| Compression ratio | 18:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 5.5 l (5.81 US qt | 4.84 UK qt) |
| Coolant | 12 l (12.68 US qt | 10.56 UK qt) |
| Kerb Weight | 1720 kg (3791.95 lbs.) |
| Max. weight | 2200 kg (4850.17 lbs.) |
| Max load | 480 kg (1058.22 lbs.) |
| Trunk (boot) space – minimum | 246 l (8.69 cu. ft.) |
| Trunk (boot) space – maximum | 315 l (11.12 cu. ft.) |
| Fuel tank capacity | 70 l (18.49 US gal | 15.4 UK gal) |
| Permitted trailer load with brakes (8%) | 1800 kg (3968.32 lbs.) |
| Permitted trailer load with brakes (12%) | 1600 kg (3527.4 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 80 kg (176.37 lbs.) |
| Length | 4573 mm (180.04 in.) |
| Width | 1777 mm (69.96 in.) |
| Height | 1391 mm (54.76 in.) |
| Wheelbase | 2654 mm (104.49 in.) |
| Front track | 1523 mm (59.96 in.) |
| Rear (Back) track | 1523 mm (59.96 in.) |
| Drag coefficient (Cd) | 0.30 |
| Minimum turning circle (turning diameter) | 11.1 m (36.42 ft.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the front wheels of the vehicle. |
| Drive wheel | Front wheel drive |
| Number of gears and type of gearbox | automatic transmission Multitronic |
| 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 | 215/55 R16 |
| Wheel rims size | 7J x 16 |
Powertrain & Engine Architecture
The heart of this A4 Cabriolet is the 2.5-liter V6 TDI engine, identified by engine codes BDG and BFC. This engine is a 24-valve, direct-injection diesel featuring a turbocharger and intercooler. Direct injection, utilizing common rail technology, allowed for precise fuel delivery and optimized combustion, contributing to both power and efficiency. The engine’s V6 configuration provided inherent smoothness and balance, a characteristic often sought after in premium vehicles. The Multitronic transmission, a continuously variable transmission (CVT), was a key feature. Unlike traditional automatic transmissions with fixed gear ratios, the Multitronic offered a seamless and stepless gear change, optimizing engine speed for efficiency or performance. The Multitronic used a chain-driven system, offering durability, but also requiring specific maintenance intervals.
Driving Characteristics
The 163 hp and 310 Nm (228.64 lb-ft) of torque delivered by the 2.5 TDI engine, coupled with the Multitronic transmission, provided a relaxed and refined driving experience. While not overtly sporty, the engine offered ample torque from low RPMs, making it well-suited for everyday driving and overtaking maneuvers. The Multitronic transmission, while smooth, could sometimes feel less responsive than a traditional automatic or manual gearbox, particularly when demanding quick acceleration. Compared to the 1.8T petrol versions, the TDI offered significantly more torque and better fuel economy, but with slightly slower acceleration. Against the more powerful 3.0 V6 models, the 2.5 TDI provided a more economical and accessible option, sacrificing some outright performance for improved running costs.
Equipment & Trim Levels
The 2.5 TDI V6 Multitronic Cabriolet typically came equipped with a respectable level of standard features. These included automatic climate control, power windows and mirrors, a multi-function steering wheel, and an upgraded audio system. Interior upholstery was generally cloth, with leather options available as an upgrade. Optional extras could include heated front seats, a sunroof, parking sensors, and a navigation system. Trim levels varied slightly depending on the market, but generally followed Audi’s established SE, Sport, and S-Line designations, with the 2.5 TDI often positioned within the SE or Sport trims.
Chassis & Braking
The B6 A4 Cabriolet featured fully independent multi-link suspension at both the front and rear, providing a comfortable ride and good handling characteristics. The 2.5 TDI models, due to their weight, typically utilized ventilated front disc brakes and solid rear discs. Anti-lock Braking System (ABS) was standard. Stabilizer bars were fitted front and rear to reduce body roll during cornering. The suspension tuning was geared towards comfort, but still offered a reasonably engaging driving experience.
Market Reception & Comparison
The Audi A4 Cabriolet 2.5 TDI V6 Multitronic was generally well-received by automotive critics, particularly for its refined driving experience, fuel efficiency, and comfortable interior. The Multitronic transmission was praised for its smoothness, but some reviewers noted its lack of responsiveness in certain situations. Compared to its petrol-powered siblings, the TDI offered a compelling value proposition for drivers prioritizing fuel economy and torque. Reliability was generally good, although the Multitronic transmission required regular servicing to prevent potential issues.
Legacy
Today, the Audi A4 Cabriolet (B6 8H) 2.5 TDI V6 Multitronic represents a well-built and relatively affordable entry point into Audi ownership. The 2.5 TDI engine, when properly maintained, is known for its durability. However, potential buyers should be aware of the maintenance requirements of the Multitronic transmission, including regular fluid changes. These cars are increasingly sought after by enthusiasts who appreciate their blend of style, comfort, and diesel efficiency. Finding well-maintained examples is becoming more challenging, but the A4 Cabriolet 2.5 TDI remains a capable and enjoyable open-top tourer.
