The Mercedes-Benz G 400 CDI, produced from February 2001 to August 2006, represents a significant iteration of the iconic G-Class (W463) following its 2000 facelift. This variant, equipped with a 4.0-liter V8 turbodiesel engine and a five-speed automatic transmission, was positioned as a premium offering within the G-Class range, blending robust off-road capability with a degree of luxury. It served primarily as a flagship diesel option in European and select international markets, appealing to buyers seeking both performance and fuel efficiency in a highly capable SUV. The G 400 CDI aimed to bridge the gap between the more utilitarian base models and the high-performance gasoline-powered G500.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | G-class |
| Generation | G-class (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 |
| Seats | 5 |
| Doors | 3 |
| 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 | 10 kg/Hp, 100.4 Hp/tonne |
| Weight-to-torque ratio | 4.4 kg/Nm, 224.9 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 | 2490 kg (5489.51 lbs.) |
| Max. weight | 2850 kg (6283.17 lbs.) |
| Max load | 360 kg (793.66 lbs.) |
| Trunk (boot) space – minimum | 250 l (8.83 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) |
| Max. roof load | 150 kg (330.69 lbs.) |
| Permitted trailer load with brakes (12%) | 2850 kg (6283.17 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Length | 4230 mm (166.54 in.) |
| Width | 1760 mm (69.29 in.) |
| Width including mirrors | 2007 mm (79.02 in.) |
| Height | 1931 mm (76.02 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 | 36° |
| Departure angle | 27° |
| 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 |
Powertrain & Engine Architecture
The heart of the G 400 CDI is the OM 628.962, a 3.996-liter (243.85 cubic inches) V8 turbodiesel engine. This engine utilizes a common rail direct injection system, delivering fuel at extremely high pressure for optimized combustion. The engine boasts four valves per cylinder and a double overhead camshaft (DOHC) valvetrain. A turbocharger with an intercooler further enhances performance by increasing air intake density. The engine produces 250 horsepower at 4400 rpm and a substantial 560 Nm (413 lb-ft) of torque between 1700 and 2600 rpm. This torque output, available across a broad rev range, is a key characteristic of the engine, providing strong pulling power both on and off-road. The engine’s 18.5:1 compression ratio is typical for a diesel engine, contributing to its efficiency. The engine is longitudinally mounted in the chassis. The five-speed automatic transmission, a robust unit designed to handle the engine’s torque, provides smooth and relatively quick gear changes.
Driving Characteristics
The G 400 CDI offers a unique driving experience. While not as overtly sporty as the gasoline-powered G500, the diesel engine’s abundant torque provides effortless acceleration and strong performance in various driving conditions. The automatic transmission, while not offering the latest in shift technology, is reliable and well-suited to the engine’s characteristics. The gear ratios are optimized for both on-road cruising and low-speed off-road maneuvering. Compared to the manual transmission options available in other G-Class variants, the automatic prioritizes ease of use over outright driver engagement. The substantial weight of the vehicle (2490 kg / 5489.51 lbs) is noticeable, but the engine’s torque mitigates this to a degree. The 0-60 mph time of around 9.4 seconds is respectable for a vehicle of this size and capability.
Equipment & Trim Levels
The G 400 CDI typically came well-equipped, reflecting its position as a premium model. Standard features often included leather upholstery, automatic climate control, power windows and locks, and an upgraded audio system. Optional extras could include a sunroof, heated seats, and various exterior enhancements. The interior design, while functional, is relatively understated, focusing on durability and practicality rather than outright luxury. The dashboard layout is typical of Mercedes-Benz vehicles of the era, with a clear and logical arrangement of controls.
Chassis & Braking
The G 400 CDI retains the G-Class’s legendary ladder-frame chassis, providing exceptional strength and off-road durability. The suspension consists of coil springs and rigid axles with trailing arms, offering a comfortable ride on paved roads while maintaining excellent articulation for off-road use. The braking system features ventilated discs at the front and solid discs at the rear, coupled with an Anti-lock Braking System (ABS) for enhanced safety. The steering is a recirculating ball system with hydraulic power assistance, providing precise control and a substantial feel.
Market Reception & Comparison
The G 400 CDI was generally well-received by automotive critics, who praised its powerful engine, robust build quality, and exceptional off-road capability. However, some criticized its relatively high fuel consumption (12.8 l/100 km combined) and somewhat dated interior. Compared to the G500, the G 400 CDI offered a more fuel-efficient alternative with comparable performance in many real-world driving scenarios. Compared to lower-powered diesel variants, the G 400 CDI provided a significant performance upgrade, justifying its higher price point.
Legacy
The OM 628 engine, while robust, can require significant maintenance as it ages, particularly concerning the fuel injection system and turbocharger. The automatic transmission, if properly maintained, is generally reliable. Today, the G 400 CDI is a sought-after vehicle among G-Class enthusiasts, appreciated for its unique combination of power, capability, and relative rarity. Well-maintained examples command a premium in the used car market, reflecting the enduring appeal of the G-Class and the desirability of this particular V8 diesel variant. Its robust construction and capable powertrain ensure it remains a viable and enjoyable vehicle for years to come.
