The Mercedes-Benz G-Class Cabriolet G 400 CDI, produced from February 2001 to August 2006, represents a unique blend of luxury, off-road capability, and open-air motoring within the iconic G-Wagen lineage. Part of the W463 series, which received a significant facelift in 2000, this variant combined the robust engineering of the G-Class with a powerful diesel V8 engine and a convenient automatic transmission. It occupied a premium position in the G-Class lineup, appealing to buyers seeking a distinctive and capable vehicle without the performance focus of the gasoline-powered AMG models. The G 400 CDI Cabriolet was primarily marketed in Europe and select international markets, offering a niche alternative to more conventional luxury convertibles.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | G-class |
| Generation | G-class Cabriolet (W463, facelift 2000) |
| Type (Engine) | G 400 CDI V8 (250 Hp) 4MATIC Automatic |
| Start of production | February, 2001 |
| End of production | August, 2006 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Off-road vehicle, Cabriolet |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (economy) – urban (NEDC) | 16.1 l/100 km (14.6 US mpg, 17.5 UK mpg, 6.2 km/l) |
| Fuel consumption (economy) – extra urban (NEDC) | 11 l/100 km (21.4 US mpg, 25.7 UK mpg, 9.1 km/l) |
| Fuel consumption (economy) – combined (NEDC) | 12.8 l/100 km (18.4 US mpg, 22.1 UK mpg, 7.8 km/l) |
| CO2 emissions (NEDC) | 343 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 | 182 km/h (113.09 mph) |
| Emission standard | Euro 3 |
| Weight-to-power ratio | 9.9 kg/Hp, 101 Hp/tonne |
| Weight-to-torque ratio | 4.4 kg/Nm, 226.3 Nm/tonne |
| Power | 250 Hp @ 4400 rpm |
| Power per litre | 62.6 Hp/l |
| Torque | 560 Nm @ 1700-2600 rpm (413.03 lb.-ft. @ 1700-2600 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 628.962 |
| Engine displacement | 3996 cm3 (243.85 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 86 mm (3.39 in.) |
| Piston Stroke | 86 mm (3.39 in.) |
| Compression ratio | 18.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 9 l (9.51 US qt | 7.92 UK qt) |
| Coolant | 10.8 l (11.41 US qt | 9.5 UK qt) |
| Kerb Weight | 2475 kg (5456.44 lbs.) |
| Max. weight | 2850 kg (6283.17 lbs.) |
| Max load | 375 kg (826.73 lbs.) |
| Trunk (boot) space – minimum | 238 l (8.4 cu. ft.) |
| Trunk (boot) space – maximum | 1580 l (55.8 cu. ft.) |
| Fuel tank capacity | 96 l (25.36 US gal | 21.12 UK gal) |
| Permitted trailer load with brakes (12%) | 2850 kg (6283.17 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Length | 4275 mm (168.31 in.) |
| Width | 1760 mm (69.29 in.) |
| Width including mirrors | 2007 mm (79.02 in.) |
| Height | 1941 mm (76.42 in.) |
| Wheelbase | 2400 mm (94.49 in.) |
| Front track | 1475 mm (58.07 in.) |
| Rear (Back) track | 1475 mm (58.07 in.) |
| Ride height (ground clearance) | 205 mm (8.07 in.) |
| Minimum turning circle (turning diameter) | 11.3 m (37.07 ft.) |
| Approach angle | 34° |
| Departure angle | 26° |
| Ramp-over (brakeover) angle | 23° |
| Climb angle | 38.7° |
| Wading depth | 500 mm (19.69 in.) |
| 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 | 5 gears, automatic transmission |
| Front suspension | Coil spring, Rigid axle suspension, Trailing arm |
| Rear suspension | Rigid axle suspension, Trailing arm, Coil spring |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Cone worm with recirculation balls |
| Power steering | Hydraulic Steering |
| Tires size | 265/60 R 18 |
| Wheel rims size | 7.5 J x 18 H 2 |
Powertrain & Engine Architecture
The G 400 CDI Cabriolet was powered by the OM 628.962, a 4.0-liter V8 diesel engine. This engine was a significant departure from the earlier inline-six diesel options in the G-Class, offering substantially more power and torque. The OM 628 featured a common rail direct injection system, delivering fuel at extremely high pressures for improved combustion efficiency and reduced emissions. A turbocharger with an intercooler further enhanced performance. The engine produced 250 horsepower at 4400 rpm and a robust 560 Nm (413 lb-ft) of torque between 1700 and 2600 rpm. This torque output, available across a broad rev range, was particularly well-suited to the G-Class’s off-road capabilities. The engine utilized a double overhead camshaft (DOHC) valvetrain with four valves per cylinder. The engine was longitudinally mounted in the front of the vehicle. The 5-speed automatic transmission, a robust unit designed to handle the engine’s torque, provided smooth and convenient gear changes.
Driving Characteristics
The G 400 CDI Automatic offered a unique driving experience. While not as overtly sporty as some of its gasoline-powered counterparts, the diesel V8 provided ample power for both on-road cruising and challenging off-road terrain. The automatic transmission, while not offering the driver engagement of a manual, contributed to a relaxed and comfortable driving style. Acceleration to 60 mph took approximately 9.4 seconds, and the vehicle had a top speed of 113 mph. The high torque output meant that the G 400 CDI felt strong and responsive even when fully loaded or tackling steep inclines. The automatic transmission’s gear ratios were optimized for both fuel efficiency and off-road performance, providing a balance between usability and capability. Compared to the G 320, the 400 CDI offered a noticeable increase in power and torque, resulting in improved acceleration and towing capacity.
Equipment & Trim Levels
The G 400 CDI Cabriolet was well-equipped, reflecting its premium positioning within the G-Class range. Standard features typically included leather upholstery, heated front seats, automatic climate control, and a high-quality audio system. The Cabriolet top was a manually operated soft top, offering an open-air driving experience. Optional extras included a sunroof, upgraded audio systems, and various interior trim options. The interior design was functional and robust, reflecting the G-Class’s utilitarian origins, but also incorporated luxury touches to enhance comfort and refinement.
Chassis & Braking
The G 400 CDI Cabriolet retained the G-Class’s legendary chassis, a robust ladder frame construction that provided exceptional strength and durability. The suspension consisted of coil springs and rigid axles with trailing arms, offering a comfortable ride and excellent off-road articulation. Front brakes were ventilated discs, while rear brakes were solid discs. An anti-lock braking system (ABS) was standard. The steering was a recirculating ball system with hydraulic power assistance. The vehicle’s high ground clearance (205 mm) and impressive approach, departure, and ramp-over angles (34°, 26°, and 23° respectively) made it highly capable off-road.
Market Reception & Comparison
The G 400 CDI Cabriolet was generally well-received by automotive critics, who praised its unique combination of luxury, off-road capability, and open-air motoring. The diesel V8 engine was lauded for its power and torque, while the automatic transmission was appreciated for its smoothness and convenience. Fuel economy, while not exceptional, was reasonable for a vehicle of its size and capability. Compared to other G-Class variants, the 400 CDI offered a compelling alternative to the gasoline-powered models, particularly for buyers who prioritized torque and fuel efficiency.
Legacy
The OM 628 engine, while robust, can require significant maintenance as it ages, particularly concerning the fuel injection system and turbocharger. The 5-speed automatic transmission is generally reliable but may require servicing over time. Today, the G 400 CDI Cabriolet is a sought-after vehicle among collectors and enthusiasts, appreciated for its rarity and unique character. Well-maintained examples command premium prices in the used car market. The G 400 CDI represents a fascinating chapter in the G-Class’s history, showcasing the versatility and enduring appeal of this iconic off-road vehicle.
