The Mercedes-Benz E 350 CDI BlueEFFICIENCY 4MATIC, produced between September 2009 and October 2010, represented a compelling blend of performance, efficiency, and luxury within the W212 E-Class range. Positioned as a mid-to-upper tier offering, this variant combined a potent turbocharged diesel V6 engine with a sophisticated all-wheel-drive system and a seven-speed automatic transmission. It aimed to deliver a refined driving experience for buyers prioritizing both power and fuel economy, particularly in markets where diesel engines were favored. The W212 generation E-Class, launched in 2009, was a significant evolution of the long-running E-Class lineage, introducing a more sculpted exterior design and a technologically advanced interior.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | E-class |
| Generation | E-class (W212) |
| Type | E 350 CDI BlueEFFICIENCY V6 (231 Hp) 4MATIC 7G-TRONIC |
| Start of production | September, 2009 |
| End of production | October, 2010 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 9-9.2 l/100 km (26.1 – 25.6 US mpg) |
| Fuel consumption (extra urban) | 5.8-6 l/100 km (40.6 – 39.2 US mpg) |
| Fuel consumption (combined) | 7-7.2 l/100 km (33.6 – 32.7 US mpg) |
| CO2 emissions | 183-188 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 7.1 sec |
| Acceleration 0 – 62 mph | 7.1 sec |
| Acceleration 0 – 60 mph | 6.7 sec |
| Maximum speed | 245 km/h (152.24 mph) |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 7.9 kg/Hp |
| Weight-to-torque ratio | 3.4 kg/Nm |
| Power | 231 Hp @ 3800 rpm |
| Torque | 540 Nm @ 1600-2400 rpm (398.28 lb.-ft.) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 642.856 |
| 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 | 15.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 8 l (8.45 US qt | 7.04 UK qt) |
| Kerb Weight | 1815 kg (4001.39 lbs.) |
| Max. weight | 2415 kg (5324.16 lbs.) |
| Max load | 600 kg (1322.77 lbs.) |
| Trunk (boot) space | 540 l (19.07 cu. ft.) |
| Fuel tank capacity | 80 l (21.13 US gal | 17.6 UK gal) |
| Length | 4868 mm (191.65 in.) |
| Width | 1854 mm (72.99 in.) |
| Height | 1470 mm (57.87 in.) |
| Wheelbase | 2874 mm (113.15 in.) |
| Front track | 1600 mm (62.99 in.) |
| Rear track | 1619 mm (63.74 in.) |
| Drivetrain Architecture | All wheel drive (4×4) |
| Number of gears | 7 |
| Gearbox type | Automatic transmission G-TRONIC |
Powertrain & Engine Architecture
At the heart of the E 350 CDI BlueEFFICIENCY 4MATIC lies the OM 642.856 3.0-liter V6 diesel engine. This engine, a mainstay of Mercedes-Benz’s diesel offerings, featured a robust cast iron block and aluminum cylinder heads. 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 engine produced 231 horsepower at 3800 rpm and a substantial 540 Nm (398 lb-ft) of torque between 1600 and 2400 rpm. This broad torque curve was a key characteristic of the engine, providing strong pulling power across a wide range of engine speeds. The 7G-TRONIC seven-speed automatic transmission, known for its smooth and responsive shifts, was standard. This transmission featured a torque converter lock-up clutch to improve fuel efficiency at cruising speeds.
Driving Characteristics
The combination of the torquey diesel engine and the seven-speed automatic resulted in a relaxed and effortless driving experience. Acceleration from 0 to 60 mph took approximately 6.7 seconds, making it a reasonably quick vehicle for its class. The 7G-TRONIC transmission was well-matched to the engine’s characteristics, providing seamless gear changes and contributing to a refined ride. Compared to the gasoline-powered E 350, the CDI offered significantly better fuel economy and a more substantial low-end torque. However, it lacked the higher-revving character and sporty feel of its gasoline counterpart. Compared to the E 320 CDI, the E 350 CDI offered a noticeable power increase, but at a slightly higher price point. The 4MATIC all-wheel-drive system provided enhanced traction and stability, particularly in adverse weather conditions.
Equipment & Trim Levels
The E 350 CDI BlueEFFICIENCY 4MATIC typically came well-equipped with standard features such as leather upholstery, dual-zone automatic climate control, a premium audio system, and power-adjustable front seats. Optional extras included a navigation system, a panoramic sunroof, adaptive cruise control, and a driver assistance package with features like lane keeping assist and blind spot monitoring. The “BlueEFFICIENCY” designation indicated the inclusion of various fuel-saving technologies, such as optimized aerodynamics and low-rolling-resistance tires. Interior trim options ranged from wood veneers to aluminum accents, allowing buyers to personalize the cabin to their preferences.
Chassis & Braking
The W212 E-Class featured a sophisticated suspension system designed to balance comfort and handling. The front suspension utilized a multi-link setup with coil springs, while the rear suspension employed a multi-link independent suspension. Many vehicles were equipped with optional air suspension, which provided an even more comfortable ride and allowed for adjustable ride height. Braking duties were handled by ventilated disc brakes on all four wheels, providing ample stopping power. Anti-lock brakes (ABS), electronic stability control (ESP), and traction control were standard safety features.
Market Reception & Comparison
The E 350 CDI BlueEFFICIENCY 4MATIC was generally well-received by automotive critics. It was praised for its refined driving experience, strong fuel economy, and luxurious interior. However, some reviewers noted that the diesel engine could be somewhat noisy compared to gasoline engines. Compared to the E 350 gasoline model, the CDI offered superior fuel economy and torque, making it a popular choice for drivers who prioritized efficiency and practicality. Against competitors like the BMW 535d and Audi A6 3.0 TDI, the E 350 CDI offered a comparable level of performance and luxury.
Legacy
The OM 642 engine family, including the OM 642.856 found in the E 350 CDI, is known for its durability and reliability. With proper maintenance, these engines can accumulate high mileage without major issues. The 7G-TRONIC transmission is also generally considered to be a reliable unit. In the used car market, the W212 E 350 CDI 4MATIC remains a desirable option for buyers seeking a comfortable, efficient, and well-equipped luxury sedan. However, potential buyers should be aware of the potential for diesel particulate filter (DPF) issues, particularly on vehicles that have primarily been used for short trips. Regular servicing and the use of high-quality diesel fuel are essential for maintaining the long-term health of this powertrain.
