The Mercedes-Benz M-Class (W164) ML 280 CDI 4MATIC, produced from 2005 to 2008, represented a significant step forward for Mercedes-Benz in the burgeoning mid-size luxury SUV segment. Positioned as a diesel-powered alternative within the W164 range, it offered a blend of performance, fuel efficiency, and all-weather capability. This variant, equipped with the OM642.940 V6 diesel engine and a 7G-TRONIC automatic transmission, aimed to appeal to buyers seeking a capable and refined SUV without the higher running costs associated with gasoline engines. It sat in the mid-range of the M-Class lineup, offering a step up in performance and features from the base ML 300, but remaining more accessible than the higher-performance ML 500.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | M-Class |
| Generation | M-Class (W164) |
| Type | ML 280 CDI V6 (190 Hp) 4MATIC 7G-TRONIC |
| Start of production | 2005 |
| End of production | 2008 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 12.7-12.8 l/100 km (18.5 – 18.4 US mpg, 22.2 – 22.1 UK mpg, 7.9 – 7.8 km/l) |
| Fuel consumption (extra urban) | 7.5-7.8 l/100 km (31.4 – 30.2 US mpg, 37.7 – 36.2 UK mpg, 13.3 – 12.8 km/l) |
| Fuel consumption (combined) | 9.4-9.6 l/100 km (25 – 24.5 US mpg, 30.1 – 29.4 UK mpg, 10.6 – 10.4 km/l) |
| CO2 emissions | 249-254 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 10.4 sec |
| Acceleration 0 – 62 mph | 10.4 sec |
| Acceleration 0 – 60 mph | 9.9 sec |
| Maximum speed | 200 km/h (124.27 mph) |
| Weight-to-power ratio | 11.1 kg/Hp, 90 Hp/tonne |
| Weight-to-torque ratio | 4.8 kg/Nm, 208.5 Nm/tonne |
| Power | 190 Hp |
| Power per litre | 63.6 Hp/l |
| Torque | 440 Nm @ 1400 rpm (324.53 lb.-ft. @ 1400 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 642.940 |
| Engine displacement | 2987 cm3 (182.28 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | V-engine |
| Cylinder Bore | 83 mm (3.27 in.) |
| Piston Stroke | 92 mm (3.62 in.) |
| Compression ratio | 18:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Engine oil capacity | 9 l (9.51 US qt | 7.92 UK qt) |
| Kerb Weight | 2110 kg (4651.75 lbs.) |
| Max. weight | 2830 kg (6239.08 lbs.) |
| Max load | 720 kg (1587.33 lbs.) |
| Trunk (boot) space – minimum | 551 l (19.46 cu. ft.) |
| Trunk (boot) space – maximum | 2050 l (72.4 cu. ft.) |
| Fuel tank capacity | 95 l (25.1 US gal | 20.9 UK gal) |
| Length | 4780 mm (188.19 in.) |
| Width | 1911 mm (75.24 in.) |
| Height | 1815 mm (71.46 in.) |
| Wheelbase | 2915 mm (114.76 in.) |
| Front track | 1627 mm (64.06 in.) |
| Rear (Back) track | 1629 mm (64.13 in.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 7 gears, automatic transmission |
| Front suspension | Double wishbone |
| Rear suspension | Spring Strut |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Tires size | 235/65 R17 |
| Wheel rims size | 7.5J x 17 |
INTRODUCTION
The W164 M-Class, launched in 2005, represented a significant departure from its predecessor, the W163. Larger, more refined, and boasting a more luxurious interior, the W164 aimed to compete directly with established players like the BMW X5 and the Porsche Cayenne. The ML 280 CDI 4MATIC, introduced as part of the W164 range, offered a compelling alternative to gasoline-powered models, particularly in European markets where diesel fuel was more prevalent and often subject to lower taxation. Its combination of a powerful V6 diesel engine, a sophisticated automatic transmission, and Mercedes-Benz’s renowned 4MATIC all-wheel-drive system made it a capable and comfortable SUV for both on-road and light off-road use.
Powertrain & Engine Architecture
At the heart of the ML 280 CDI 4MATIC lies the OM642.940 3.0-liter V6 diesel engine. This engine, a cornerstone of Mercedes-Benz’s diesel lineup, features a robust cast iron block and aluminum cylinder heads. It utilizes a common rail direct injection system, delivering fuel at extremely high pressures for optimized combustion and reduced emissions. A variable geometry turbocharger with an intercooler further enhances performance, providing increased boost across a wider RPM range. The engine produces 190 horsepower and a substantial 440 Nm (324.53 lb-ft) of torque at just 1400 rpm. This torque output is a key characteristic of the engine, providing strong pulling power and effortless acceleration. The engine is paired with Mercedes-Benz’s 7G-TRONIC seven-speed automatic transmission. This transmission, known for its smooth and responsive shifts, features a torque converter lock-up clutch to improve fuel efficiency. The 7G-TRONIC also offers a manual shift mode, allowing drivers to select gears for more control.
Driving Characteristics
The ML 280 CDI 4MATIC delivers a driving experience characterized by relaxed cruising and strong mid-range acceleration. The abundant torque from the diesel engine makes overtaking effortless, even when fully loaded. While not a sports SUV, the ML 280 CDI offers a composed and stable ride, thanks to its well-tuned suspension and all-wheel-drive system. The 7G-TRONIC transmission contributes to a smooth and refined driving experience, with seamless gear changes. Compared to the higher-output ML 500, the ML 280 CDI feels less urgent in its acceleration, but its superior fuel economy and lower running costs make it a more practical choice for many buyers. The gear ratios in the 7G-TRONIC are optimized for both fuel efficiency and performance, providing a good balance between the two. The 4MATIC system provides excellent traction in all weather conditions, enhancing safety and confidence.
Equipment & Trim Levels
The ML 280 CDI 4MATIC typically came equipped with a generous array of standard features, including automatic climate control, power-adjustable front seats, a premium audio system, and leather upholstery. Safety features included ABS, traction control, stability control, and multiple airbags. Optional extras included a sunroof, navigation system, heated seats, and a rear entertainment system. Interior trim options varied, with choices ranging from wood veneers to aluminum accents. The dashboard layout was typical of Mercedes-Benz at the time, with a focus on elegance and functionality. The ML 280 CDI generally occupied a mid-range position in the W164 lineup, offering a good balance of features and price.
Chassis & Braking
The W164 M-Class features a robust chassis with independent suspension all around. The front suspension utilizes a double wishbone design, while the rear suspension employs a multi-link setup. This configuration provides a comfortable ride and good handling characteristics. The ML 280 CDI is equipped with ventilated disc brakes at the front and solid disc brakes at the rear. ABS (Anti-lock Braking System) is standard, providing enhanced braking performance and stability. The steering system is a rack-and-pinion setup, offering precise and responsive steering feel.
Market Reception & Comparison
The ML 280 CDI 4MATIC was generally well-received by automotive critics, who praised its fuel efficiency, comfortable ride, and refined interior. However, some critics noted that its acceleration was not as brisk as that of its gasoline-powered counterparts. Compared to the ML 350 (gasoline), the ML 280 CDI offered significantly better fuel economy, making it a more economical choice for high-mileage drivers. Compared to the ML 500, the ML 280 CDI was more affordable and offered a more sensible balance of performance and running costs. Reliability reports suggest that the OM642 engine is generally robust, but regular maintenance is essential to prevent issues with the fuel injection system and turbocharger.
Legacy
The ML 280 CDI 4MATIC remains a popular choice in the used car market, particularly in Europe. Its combination of fuel efficiency, reliability, and all-weather capability makes it a practical and appealing SUV. The OM642 engine, while requiring regular maintenance, is known for its longevity and durability. However, potential buyers should be aware of potential issues with the diesel particulate filter (DPF) and the glow plug system. Overall, the ML 280 CDI 4MATIC represents a well-engineered and capable SUV that continues to offer good value for money.
