The Mercedes-Benz M-Class (W164) ML 300 CDI BlueEFFICIENCY 4MATIC, produced from 2010 to 2011, represented a mid-cycle update to the second-generation M-Class. This variant, equipped with the OM642 V6 turbodiesel engine and a 7G-TRONIC automatic transmission, aimed to balance fuel efficiency with respectable performance within the luxury SUV segment. Positioned as a core offering in the M-Class lineup, it slotted between the entry-level ML 280 CDI and the higher-performance ML 350 CDI, appealing to buyers seeking a blend of capability and economy. The “BlueEFFICIENCY” designation signified Mercedes-Benz’s efforts to improve fuel consumption and reduce emissions through various technological enhancements.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | M-Class |
| Generation | M-Class (W164, facelift 2008) |
| Type | ML 300 CDI BlueEFFICIENCY V6 (204 Hp) 4MATIC 7G-TRONIC |
| Start of production | 2010 |
| End of production | 2011 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 10.6-11.3 l/100 km (22.2 – 20.8 US mpg) |
| Fuel consumption (extra urban) | 7.1-7.8 l/100 km (33.1 – 30.2 US mpg) |
| Fuel consumption (combined) | 8.4-9.1 l/100 km (28 – 25.8 US mpg) |
| CO2 emissions | 224-240 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 8.2 sec |
| Acceleration 0 – 60 mph | 7.8 sec |
| Maximum speed | 210 km/h (130.49 mph) |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 10.3 kg/Hp |
| Weight-to-torque ratio | 4.2 kg/Nm |
| Power | 204 Hp @ 3800 rpm |
| Torque | 500 Nm @ 1400-2400 rpm (368.78 lb.-ft.) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 642 |
| 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.) |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 8.5 l (8.98 US qt | 7.48 UK qt) |
| Coolant capacity | 9.5 l (10.04 US qt | 8.36 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 (min) | 833 l (29.42 cu. ft.) |
| Trunk (boot) space (max) | 2050 l (72.4 cu. ft.) |
| Fuel tank capacity | 95 l (25.1 US gal | 20.9 UK gal) |
| Length | 4781 mm (188.23 in.) |
| Width | 1911 mm (75.24 in.) |
| Height | 1815 mm (71.46 in.) |
| Wheelbase | 2915 mm (114.76 in.) |
| Gears/Transmission | 7 gears, automatic transmission G-TRONIC |
Powertrain & Engine Architecture
The heart of the ML 300 CDI BlueEFFICIENCY is the OM642 3.0-liter V6 turbodiesel engine. This engine, a mainstay in Mercedes-Benz’s diesel lineup, utilizes a common-rail direct injection system, delivering fuel at extremely high pressure for optimized combustion. The engine features a variable geometry turbocharger (VGT) and an intercooler to enhance power and efficiency. The DOHC valvetrain, with four valves per cylinder, contributes to improved breathing and overall performance. The “BlueEFFICIENCY” enhancements included optimized engine management, reduced friction components, and improved aerodynamics. The 7G-TRONIC automatic transmission, a seven-speed unit, was specifically tuned to complement the engine’s torque characteristics. This transmission offered smooth shifts and contributed to the vehicle’s fuel efficiency.
Driving Characteristics
The ML 300 CDI BlueEFFICIENCY offered a comfortable and capable driving experience. While not as overtly sporty as the ML 350 CDI, the 204 horsepower and 368 lb-ft of torque provided ample power for everyday driving and highway cruising. Acceleration from 0-60 mph took around 7.8 seconds, which was respectable for a vehicle of its size and weight. The 7G-TRONIC transmission’s gear ratios were well-matched to the engine’s torque curve, providing responsive acceleration in most situations. Compared to the manual transmission options available on other M-Class models, the automatic prioritized ease of use and comfort over outright performance. The 4MATIC all-wheel-drive system provided excellent traction in various weather conditions, enhancing stability and control.
Equipment & Trim Levels
The ML 300 CDI BlueEFFICIENCY typically came standard with a generous array of features, reflecting its luxury SUV positioning. Standard equipment included leather upholstery, dual-zone automatic climate control, a premium audio system, power-adjustable front seats with memory function, and a sunroof. Safety features such as ABS, traction control, stability control, and multiple airbags were also standard. Optional extras included navigation system, rear-seat entertainment system, parking assist, and upgraded wheel designs. Interior trim options allowed for some personalization, with choices in wood or aluminum accents.
Chassis & Braking
The W164 M-Class featured a robust chassis with a double wishbone front suspension and an independent multi-link rear suspension. Stabilizer bars were fitted to both axles to reduce body roll during cornering. The ML 300 CDI BlueEFFICIENCY utilized ventilated disc brakes at the front and disc brakes at the rear, providing adequate stopping power. The hydraulic power steering offered a balanced feel, providing good feedback to the driver. The suspension was tuned to prioritize comfort, but still offered reasonable handling characteristics for a vehicle of its size.
Market Reception & Comparison
The ML 300 CDI BlueEFFICIENCY was generally well-received by automotive critics. It was praised for its fuel efficiency, comfortable ride, and spacious interior. However, some reviewers noted that its performance was not as exhilarating as that of the higher-powered ML 350 CDI. Compared to the ML 280 CDI, the ML 300 CDI offered a noticeable increase in power and torque, making it a more appealing option for drivers who frequently tow or carry heavy loads. Fuel economy was competitive within the luxury SUV segment, and the ML 300 CDI BlueEFFICIENCY offered a good balance between performance and efficiency.
Legacy
The OM642 engine, used in the ML 300 CDI BlueEFFICIENCY, has proven to be a durable and reliable powerplant when properly maintained. While early versions of the OM642 were known for potential issues with the balance shaft, these were largely addressed in later iterations. The 7G-TRONIC transmission is also generally considered reliable, although regular fluid changes are essential for long-term durability. Today, the W164 M-Class ML 300 CDI BlueEFFICIENCY can be found on the used car market at relatively affordable prices. It remains a viable option for buyers seeking a comfortable, capable, and fuel-efficient luxury SUV, provided they are aware of the potential maintenance requirements associated with a diesel engine and a higher-mileage vehicle.
