The Mercedes-Benz E 350 CDI BlueEFFICIENCY 4MATIC, produced between October 2010 and January 2013, 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 engine with a sophisticated all-wheel-drive system and a smooth-shifting seven-speed automatic transmission. It catered to buyers seeking a refined driving experience with strong torque delivery and all-weather capability. The E 350 CDI BlueEFFICIENCY occupied a space between the more economical E 250 CDI models and the higher-performance E 550 variants.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | E-class |
| Generation | E-class (W212) |
| Type | E 350 CDI BlueEFFICIENCY V6 (265 Hp) 4MATIC 7G-TRONIC PLUS |
| Start of production | October, 2010 |
| End of production | January, 2013 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 8.2-8.3 l/100 km (28.7 – 28.3 US mpg) |
| Fuel consumption (extra urban) | 5.5-5.6 l/100 km (42.8 – 42 US mpg) |
| Fuel consumption (combined) | 6.6-6.7 l/100 km (35.6 – 35.1 US mpg) |
| CO2 emissions | 173-175 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 6.7 sec |
| Acceleration 0 – 62 mph | 6.7 sec |
| Acceleration 0 – 60 mph | 6.4 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 6.9 kg/Hp |
| Weight-to-torque ratio | 2.9 kg/Nm |
| Power | 265 Hp @ 3800 rpm |
| Torque | 620 Nm @ 1600-2400 rpm (457.29 lb.-ft. @ 1600-2400 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 642.858 |
| 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) |
| Coolant capacity | 12.3 l (13 US qt | 10.82 UK qt) |
| Kerb Weight | 1825 kg (4023.44 lbs.) |
| Max. weight | 2445 kg (5390.3 lbs.) |
| Max load | 620 kg (1366.87 lbs.) |
| Trunk (boot) space (minimum) | 540 l (19.07 cu. ft.) |
| Fuel tank capacity | 80 l (21.13 US gal | 17.6 UK gal) |
| Max. roof load | 100 kg (220.46 lbs.) |
| Permitted trailer load (with brakes) | 2100 kg (4629.71 lbs.) |
| Permitted trailer load (without brakes) | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 84 kg (185.19 lbs.) |
| Length | 4868 mm (191.65 in.) |
| Width | 1854 mm (72.99 in.) |
| Width including mirrors | 2071 mm (81.54 in.) |
| Height | 1471 mm (57.91 in.) |
| Wheelbase | 2874 mm (113.15 in.) |
| Front track | 1598 mm (62.91 in.) |
| Rear track | 1614 mm (63.54 in.) |
| Front overhang | 841 mm (33.11 in.) |
| Rear overhang | 1153 mm (45.39 in.) |
| Drag coefficient (Cd) | 0.27 |
| Minimum turning circle | 11.25 m (36.91 ft.) |
| Drivetrain Architecture | All wheel drive (4×4) |
| Number of gears | 7 |
| Gearbox type | Automatic transmission G-TRONIC PLUS |
| Front suspension | Coil spring, Independent multi-link suspension, Transverse stabilizer, Air Suspension – Optional |
| Rear suspension | Independent multi-link spring suspension with stabilizer, Air Suspension – Optional |
| Front brakes | Ventilated discs, 322 mm |
| Rear brakes | Ventilated discs, 300 mm |
Powertrain & Engine Architecture
The heart of the E 350 CDI BlueEFFICIENCY was the OM 642.858 3.0-liter V6 diesel engine. This engine was a cornerstone of Mercedes-Benz’s diesel offerings, known for its robust construction and refined operation. It 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 produced 265 horsepower at 3800 rpm and a substantial 620 Nm (457 lb-ft) of torque between 1600 and 2400 rpm. This broad torque curve provided strong acceleration in virtually any gear. The 7G-TRONIC PLUS seven-speed automatic transmission was specifically calibrated to work in harmony with the diesel engine’s characteristics, offering smooth and responsive shifts. The transmission featured a torque converter lock-up clutch to improve fuel economy at cruising speeds.
Driving Characteristics
The E 350 CDI 4MATIC offered a distinctly different driving experience compared to its gasoline-powered siblings or even the lower-output diesel variants. The abundant torque meant effortless overtaking and strong acceleration from low speeds. While not a sports car, the E 350 CDI felt surprisingly agile for its size, thanks in part to the 4MATIC all-wheel-drive system, which provided excellent traction in all conditions. The 7G-TRONIC PLUS transmission contributed to a relaxed driving experience, seamlessly shifting through the gears. Compared to the manual transmission options available on other E-Class models, the automatic prioritized comfort and ease of use over outright driver engagement. The gear ratios were optimized for both fuel efficiency and strong acceleration, with a relatively tall final drive to maximize highway mileage.
Equipment & Trim Levels
The E 350 CDI BlueEFFICIENCY typically came well-equipped as standard. Common features included leather upholstery, dual-zone automatic climate control, a premium audio system, and a multi-function steering wheel. Optional extras were plentiful, including a panoramic sunroof, advanced driver-assistance systems (such as Distronic Plus adaptive cruise control and lane-keeping assist), and upgraded interior trim options. The “BlueEFFICIENCY” designation indicated the inclusion of various fuel-saving technologies, such as optimized aerodynamics and low-rolling-resistance tires. Interior color schemes were customizable, with a range of leather and wood trim options available.
Chassis & Braking
The W212 E-Class featured a sophisticated chassis design. The E 350 CDI 4MATIC utilized a four-wheel independent suspension system, with coil springs and multi-link setups at both the front and rear. Many examples were equipped with optional air suspension, which provided a remarkably comfortable ride and allowed for adjustable ride height. The braking system consisted of 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. The 4MATIC all-wheel-drive system employed a multi-plate clutch to distribute torque between the front and rear axles, optimizing traction based on driving conditions.
Market Reception & Comparison
The E 350 CDI BlueEFFICIENCY 4MATIC was generally well-received by automotive critics. It was praised for its refined engine, comfortable ride, and all-weather capability. Fuel economy was a strong point, with combined figures averaging around 35-36 mpg in real-world driving. Compared to the E 250 CDI, the E 350 CDI offered significantly more power and performance. However, it came at a higher price point. The E 550, with its V8 gasoline engine, provided even greater performance but at the expense of fuel economy. Reliability was generally good, although some owners reported issues with the diesel particulate filter (DPF) and the complex electronic systems.
Legacy
The OM 642 engine family, including the OM 642.858 found in the E 350 CDI, has proven to be remarkably durable. Properly maintained examples continue to provide reliable service today. The W212 E-Class, as a whole, has established a reputation for build quality and longevity. On the used car market, the E 350 CDI 4MATIC remains a desirable option for buyers seeking a comfortable, capable, and fuel-efficient luxury sedan. However, potential buyers should be aware of the potential maintenance costs associated with a diesel engine, including DPF maintenance and injector servicing. The combination of performance, efficiency, and all-wheel-drive capability ensures that the E 350 CDI BlueEFFICIENCY 4MATIC continues to hold its own against more modern competitors.
