The Mercedes-Benz M-Class (W166) ML 350 BlueTEC V6 4MATIC, produced from November 2011 to July 2015, represented a significant offering in the mid-size luxury SUV segment. Positioned as a core model within the W166 generation, it bridged the gap between the entry-level ML 250 BlueTEC and the performance-oriented ML 550. This variant focused on balancing fuel efficiency, respectable power, and the all-weather capability of Mercedes-Benz’s 4MATIC all-wheel-drive system. It was primarily marketed towards buyers seeking a comfortable and capable SUV for both daily commuting and longer journeys, with a preference for diesel power.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | M-Class |
| Generation | M-Class (W166) |
| Type | ML 350 BlueTEC V6 (258 Hp) 4MATIC 7G-TRONIC PLUS |
| Start of production | November, 2011 |
| End of production | July, 2015 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 8.4-7.8 l/100 km (28 – 30.2 US mpg) |
| Fuel consumption (extra urban) | 6.8-6.3 l/100 km (34.6 – 37.3 US mpg) |
| Fuel consumption (combined) | 7.4-6.8 l/100 km (31.8 – 34.6 US mpg) |
| CO2 emissions | 194-179 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 7.4 sec |
| Acceleration 0 – 62 mph | 7.4 sec |
| Acceleration 0 – 60 mph | 7 sec (Calculated) |
| Maximum speed | 224 km/h (139.19 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 8.4 kg/Hp |
| Weight-to-torque ratio | 3.5 kg/Nm |
| Power | 258 Hp @ 3600 rpm |
| Torque | 620 Nm @ 1600-2400 rpm (457.29 lb.-ft.) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 642 LS DE 30 LA / 642.826 |
| Engine displacement | 2987 cm3 (182.28 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | V-engine |
| Compression ratio | 15.5:1 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Engine oil capacity | 8 l (8.45 US qt | 7.04 UK qt) |
| Coolant capacity | 11.5 l (12.15 US qt | 10.12 UK qt) |
| Kerb Weight | 2175 kg (4795.05 lbs.) |
| Max. weight | 2950 kg (6503.64 lbs.) |
| Max load | 775 kg (1708.58 lbs.) |
| Trunk (boot) space – minimum | 690 l (24.37 cu. ft.) |
| Trunk (boot) space – maximum | 2010 l (70.98 cu. ft.) |
| Fuel tank capacity | 70 l (18.49 US gal | 15.4 UK gal) |
| Length | 4804 mm (189.13 in.) |
| Width | 1926 mm (75.83 in.) |
| Height | 1796 mm (70.71 in.) |
| Wheelbase | 2915 mm (114.76 in.) |
| Front track | 1648 mm (64.88 in.) |
| Rear track | 1663 mm (65.47 in.) |
| Minimum turning circle | 11.8 m (38.71 ft.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears | 7 |
| Gearbox type | Automatic transmission G-TRONIC PLUS |
| Front suspension | Double wishbone |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric |
| Tires size | 235/65 R17 |
| Wheel rims size | 17 |
Powertrain & Engine Architecture
The ML 350 BlueTEC utilized the OM 642 LS DE 30 LA engine, a 3.0-liter V6 diesel engine. This engine was a mainstay in the Mercedes-Benz lineup, known for its robust construction and relatively smooth operation for a diesel. The ‘BlueTEC’ designation indicated the inclusion of advanced emissions control technologies, including a diesel particulate filter (DPF) and a selective catalytic reduction (SCR) system utilizing AdBlue (Diesel Exhaust Fluid) to reduce NOx emissions, ensuring compliance with stringent Euro 6 standards. The engine employed 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 7G-TRONIC PLUS automatic transmission, a seven-speed unit, was standard. This transmission was known for its smooth shifts and ability to adapt to driving conditions, contributing to both fuel economy and a comfortable driving experience.
Driving Characteristics
The ML 350 BlueTEC offered a balanced driving experience. While not as overtly sporty as some of its competitors or even the higher-trim ML models, it provided ample power for everyday driving and highway cruising. The 620 Nm (457 lb-ft) of torque, available from a low 1600 rpm, provided strong acceleration and effortless overtaking. The 7G-TRONIC transmission was well-matched to the engine, offering smooth and timely gear changes. Compared to the ML 250 BlueTEC, the ML 350 offered a noticeable performance improvement. However, it lacked the outright acceleration of the ML 550. The 4MATIC all-wheel-drive system provided excellent traction in various weather conditions, enhancing stability and confidence.
Equipment & Trim Levels
The ML 350 BlueTEC typically came well-equipped as standard. Features included leather upholstery, power-adjustable front seats with memory function, dual-zone automatic climate control, a premium audio system, and a rearview camera. Optional extras included a panoramic sunroof, navigation system, heated and ventilated front seats, and a suite of advanced driver-assistance systems such as blind-spot monitoring, lane-keeping assist, and adaptive cruise control. Interior trim options ranged from wood veneers to aluminum accents, allowing for some personalization. The dashboard layout was typical of Mercedes-Benz at the time, emphasizing a luxurious and sophisticated aesthetic.
Chassis & Braking
The W166 M-Class featured a robust chassis designed for both on-road comfort and off-road capability. The front suspension utilized a double wishbone design, while the rear employed an independent multi-link setup. This configuration provided a good balance between ride comfort and handling precision. The ML 350 BlueTEC came equipped with ventilated disc brakes at the front and solid discs at the rear. Anti-lock braking system (ABS) was standard, along with electronic brake-force distribution. The steering was a rack-and-pinion system with power assistance, providing a responsive and precise feel.
Market Reception & Comparison
The ML 350 BlueTEC was generally well-received by automotive critics. It was praised for its fuel efficiency, comfortable ride, and spacious interior. The diesel engine was noted for its refinement and strong torque output. Compared to gasoline-powered rivals, the ML 350 BlueTEC offered significantly better fuel economy. However, some critics noted that the interior, while luxurious, could feel somewhat dated compared to newer competitors. Reliability was generally good, although the complex emissions control systems required periodic maintenance. The ML 350 BlueTEC offered a compelling alternative to the BMW X5 and Audi Q7, particularly for buyers prioritizing fuel economy and long-distance comfort.
Legacy
The OM 642 engine family, including the version used in the ML 350 BlueTEC, has a reputation for durability and longevity, provided it receives regular maintenance, particularly regarding the DPF and SCR systems. On the used car market, these models represent a good value proposition, offering a luxurious and capable SUV at a relatively affordable price point. However, potential buyers should be aware of the potential maintenance costs associated with the diesel emissions systems. The W166 M-Class, and the ML 350 BlueTEC in particular, helped solidify Mercedes-Benz’s position as a leader in the luxury SUV segment.
