The Mercedes-Benz M-Class (W164 facelift), specifically the ML 350 BlueTEC V6 4MATIC equipped with the 7G-TRONIC automatic transmission, was produced from 2009 to 2011. This variant occupied a key position in the M-Class lineup, offering a balance between performance, fuel efficiency, and luxury features. It represented a significant step towards cleaner diesel technology with its advanced BlueTEC emissions control system. The W164 generation M-Class, introduced in 2005, was Mercedes-Benz’s first foray into the mid-size luxury SUV segment, aiming to compete with established rivals like the BMW X5 and the Porsche Cayenne.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | M-Class |
| Generation | M-Class (W164, facelift 2008) |
| Type | ML 350 BlueTEC V6 (211 Hp) 4MATIC 7G-TRONIC |
| Start of production | 2009 |
| End of production | 2011 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 11.9-12.2 l/100 km (19.8 – 19.3 US mpg, 23.7 – 23.2 UK mpg, 8.4 – 8.2 km/l) |
| Fuel consumption (extra urban) | 6.7-7.2 l/100 km (35.1 – 32.7 US mpg, 42.2 – 39.2 UK mpg, 14.9 – 13.9 km/l) |
| Fuel consumption (combined) | 8.7-9.1 l/100 km (27 – 25.8 US mpg, 32.5 – 31 UK mpg, 11.5 – 11 km/l) |
| CO2 emissions | 231-239 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 8.7 sec |
| Acceleration 0 – 62 mph | 8.7 sec |
| Acceleration 0 – 60 mph | 8.3 sec |
| Maximum speed | 210 km/h (130.49 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 10 kg/Hp, 100 Hp/tonne |
| Weight-to-torque ratio | 3.9 kg/Nm, 255.9 Nm/tonne |
| Power | 211 Hp @ 3400 rpm |
| Power per litre | 70.6 Hp/l |
| Torque | 540 Nm @ 1600-2400 rpm (398.28 lb.-ft. @ 1600-2400 rpm) |
| 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.) |
| Compression ratio | 16.5:1 |
| 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) |
| Kerb Weight | 2110 kg (4651.75 lbs.) |
| Max. weight | 2910 kg (6415.45 lbs.) |
| Max load | 800 kg (1763.7 lbs.) |
| Trunk (boot) space – minimum | 833 l (29.42 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) |
| Permitted trailer load with brakes (12%) | 3500 kg (7716.18 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Length | 4781 mm (188.23 in.) |
| Width | 1911 mm (75.24 in.) |
| Width including mirrors | 2124 mm (83.62 in.) |
| Height | 1815 mm (71.46 in.) |
| Wheelbase | 2915 mm (114.76 in.) |
| Front track | 1627 mm (64.06 in.) |
| Rear track | 1629 mm (64.13 in.) |
| Front overhang | 866 mm (34.09 in.) |
| Rear overhang | 1000 mm (39.37 in.) |
| Ride height (ground clearance) | 210 mm (8.27 in.) |
| Minimum turning circle | 11.6 m (38.06 ft.) |
| Approach angle | 27° |
| Departure angle | 26° |
| Ramp-over angle | 17° |
| Climb angle | 45° |
| 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 | 7 gears, automatic transmission G-TRONIC |
| Front suspension | Double wishbone, Transverse stabilizer |
| Rear suspension | Independent multi-link suspension, Transverse stabilizer |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Front tires | 235/65 R17; 255/55 R18; 255/50 R19; 265/45 R20; 265/40 R21 |
| Rear tires | 235/65 R17; 255/55 R18; 255/50 R19; 285/45 R19; 265/45 R20; 265/40 R21 |
| Front wheel rims | 7.5J x 17; 8J x 18; 8J x 19; 8.5J x 19; 8.5J x 20; 9J x 21 |
| Rear wheel rims | 7.5J x 17; 8J x 18; 8J x 19; 9.5J x 19; 8.5J x 20; 9J x 21 |
Powertrain & Engine Architecture
The ML 350 BlueTEC utilized the OM 642 V6 diesel engine, a 3.0-liter (2987 cc) powerplant. This engine was a cornerstone of Mercedes-Benz’s diesel offerings for many years, known for its robust construction and relatively smooth operation. The OM 642 featured a common-rail direct injection system, delivering fuel at extremely high pressures for optimized combustion. A variable geometry turbocharger with an intercooler further enhanced performance and efficiency. The engine employed a double overhead camshaft (DOHC) valvetrain with four valves per cylinder. The “BlueTEC” designation indicated the inclusion of advanced emissions control technologies, including a particulate filter and a selective catalytic reduction (SCR) system utilizing AdBlue (diesel exhaust fluid) to reduce NOx emissions. The 7G-TRONIC automatic transmission, a seven-speed unit, was standard. This transmission offered smooth and efficient gear changes, contributing to both fuel economy and driving comfort. It featured a torque converter lock-up clutch to minimize slippage and improve efficiency at cruising speeds.
Driving Characteristics
The ML 350 BlueTEC with the 7G-TRONIC transmission provided a comfortable and refined driving experience. While not overtly sporty, the 211 horsepower and 540 Nm (398 lb-ft) of torque delivered adequate performance for everyday driving and highway cruising. Acceleration from 0-60 mph took approximately 8.3 seconds. The 7G-TRONIC transmission was programmed for smooth shifts, prioritizing comfort over aggressive downshifts. Compared to the higher-output ML 500 models, the ML 350 offered significantly better fuel economy, but at the expense of outright acceleration. The automatic transmission, while convenient, didn’t offer the same level of driver engagement as the available manual transmission in some European markets. The 4MATIC all-wheel-drive system provided excellent traction in various weather conditions, enhancing stability and control.
Equipment & Trim Levels
The ML 350 BlueTEC typically came standard with a comprehensive list of features, including leather upholstery, dual-zone automatic climate control, power-adjustable front seats with memory function, a premium audio system, and a sunroof. Optional extras included navigation system, rear-seat entertainment system, adaptive cruise control, and parking assist. Interior trim options varied, with choices in wood veneers and aluminum accents. The standard dashboard configuration featured analog gauges with a multi-function display. Safety features included multiple airbags, anti-lock brakes (ABS), electronic stability control (ESP), and traction control.
Chassis & Braking
The W164 M-Class featured a robust chassis with a double wishbone front suspension and an independent multi-link rear suspension. Both ends incorporated transverse stabilizers to reduce body roll during cornering. The ML 350 BlueTEC typically came equipped with ventilated disc brakes at the front and solid disc brakes at the rear. The braking system was assisted by ABS and ESP, providing enhanced stopping power and stability. The suspension was tuned for comfort, prioritizing a smooth ride over sporty handling.
Market Reception & Comparison
The ML 350 BlueTEC was generally well-received by automotive critics. It was praised for its fuel efficiency, comfortable ride, and refined interior. However, some reviewers noted that its acceleration was not as brisk as some of its competitors. Compared to the ML 320 CDI (pre-BlueTEC), the ML 350 BlueTEC offered improved emissions and slightly increased power. Against the gasoline-powered ML 500, the ML 350 BlueTEC provided significantly better fuel economy, making it a more practical choice for drivers who prioritized efficiency.
Legacy
The OM 642 engine, as used in the ML 350 BlueTEC, has proven to be a durable and reliable powerplant when properly maintained. The 7G-TRONIC transmission is also generally considered reliable, although some units have experienced issues with valve body failures. Today, used W164 ML 350 BlueTEC models represent a relatively affordable entry point into the Mercedes-Benz SUV market. Regular maintenance, including timely AdBlue refills and oil changes, is crucial for ensuring the long-term reliability of these vehicles. The ML 350 BlueTEC’s combination of luxury, fuel efficiency, and all-wheel-drive capability continues to make it a popular choice among used car buyers.
