The Mercedes-Benz E 320 CDI, produced from 2006 to 2009 as part of the W211 facelift generation, represented a compelling blend of luxury, performance, and fuel efficiency. Positioned as a mid-to-upper trim level within the E-Class range, it catered to buyers seeking a refined driving experience with the added benefit of a potent diesel engine. This variant distinguished itself from its gasoline-powered siblings (like the E350) and other diesel options (such as the E300 CDI) by offering a significant power upgrade and a sophisticated 7G-TRONIC automatic transmission. The W211 facelift, introduced in 2006, brought revised styling, updated technology, and improved refinement compared to the pre-facelift models.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | E-class |
| Generation | E-class (W211, facelift 2006) |
| Type (Engine) | E 320 CDI V6 (224 Hp) 7G-TRONIC |
| Start of production | 2006 |
| End of production | 2009 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 10.3-10.6 l/100 km (22.8 – 22.2 US mpg) |
| Fuel consumption (extra urban) | 5.6-6.0 l/100 km (42 – 39.2 US mpg) |
| Fuel consumption (combined) | 7.3-7.6 l/100 km (32.2 – 30.9 US mpg) |
| CO2 emissions | 194-202 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 6.8 sec |
| Acceleration 0 – 60 mph | 6.5 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 4 |
| Weight-to-power ratio | 7.5 kg/Hp |
| Weight-to-torque ratio | 3.1 kg/Nm |
| Power | 224 Hp @ 3800 rpm |
| Torque | 540 Nm @ 1600-2400 rpm (398.28 lb.-ft.) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 642.920 |
| 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 | 17.7:1 |
| 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) |
| Coolant capacity | 13 l (13.74 US qt | 11.44 UK qt) |
| Kerb Weight | 1675 kg (3692.74 lbs.) |
| Max. weight | 2275 kg (5015.52 lbs.) |
| Max load | 600 kg (1322.77 lbs.) |
| Trunk (boot) space (minimum) | 540 l (19.07 cu. ft.) |
| Fuel tank capacity | 80 l (21.13 US gal | 17.6 UK gal) |
| Permitted trailer load (with brakes) | 1900 kg (4188.78 lbs.) |
| Permitted trailer load (without brakes) | 750 kg (1653.47 lbs.) |
| Length | 4856 mm (191.18 in.) |
| Width | 1822 mm (71.73 in.) |
| Width including mirrors | 2063 mm (81.22 in.) |
| Height | 1484 mm (58.43 in.) |
| Wheelbase | 2854 mm (112.36 in.) |
| Front track | 1559 mm (61.38 in.) |
| Rear track | 1552 mm (61.1 in.) |
| Minimum turning circle | 11.4 m (37.4 ft.) |
Powertrain & Engine Architecture
The heart of the E 320 CDI is the OM 642.920 3.0-liter V6 diesel engine. This engine is a robust and technologically advanced design, featuring a common rail direct injection system, a variable geometry turbocharger, and an intercooler. The common rail system, operating at extremely high pressures, allows for precise fuel metering and optimized combustion, contributing to both power and efficiency. The V6 configuration provides inherent smoothness and balance compared to inline engines. The engine produces 224 horsepower at 3800 rpm and a substantial 540 Nm (398 lb-ft) of torque between 1600 and 2400 rpm. This broad torque curve is a hallmark of diesel engines and provides strong acceleration in real-world driving conditions. The engine is paired with Mercedes-Benz’s 7G-TRONIC seven-speed automatic transmission. This transmission is known for its smooth and quick shifts, contributing to both performance and fuel economy. It offers a manual shift mode for greater driver control.
Driving Characteristics
The E 320 CDI with the 7G-TRONIC transmission delivers a refined and effortless driving experience. The abundant torque allows for brisk acceleration without the need for frequent downshifts. The 7G-TRONIC transmission is well-programmed, providing seamless gear changes and keeping the engine in its optimal power band. Compared to the E350 with its gasoline engine, the E 320 CDI offers superior fuel economy and a more relaxed cruising experience. While not as overtly sporty as some of its competitors, the E 320 CDI provides ample power for highway passing and merging. The automatic transmission’s gear ratios are tuned for both acceleration and fuel efficiency, prioritizing smooth operation over aggressive shifts.
Equipment & Trim Levels
The E 320 CDI typically came well-equipped, reflecting its position as a mid-to-upper trim level. Standard features included leather upholstery, automatic climate control, a premium audio system, and power-adjustable front seats. Optional extras included a sunroof, navigation system, upgraded audio, and various driver assistance systems. Interior trim options ranged from wood veneers to aluminum accents, allowing buyers to personalize the cabin. The facelifted W211 models also benefited from improved interior materials and a more modern dashboard design.
Chassis & Braking
The E 320 CDI utilizes an independent multi-link suspension system at both the front and rear, providing a comfortable and controlled ride. A transverse stabilizer bar helps to reduce body roll during cornering. The braking system consists of ventilated discs on all four wheels, providing ample stopping power. Anti-lock brakes (ABS) and electronic stability control (ESP) are standard safety features. The suspension tuning is geared towards comfort and refinement, prioritizing a smooth ride over aggressive handling.
Market Reception & Comparison
The E 320 CDI was generally well-received by automotive critics, who praised its fuel efficiency, strong performance, and comfortable ride. It was often compared favorably to its gasoline-powered counterparts, particularly in terms of fuel economy. However, some critics noted that the diesel engine could be somewhat noisy compared to the smoother gasoline engines. Compared to the E300 CDI, the E 320 CDI offered a significant power upgrade, justifying its higher price point. The E 320 CDI represented a compelling value proposition for buyers seeking a luxurious and efficient sedan.
Legacy
The OM 642 engine family, including the OM 642.920 found in the E 320 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 reliable, although some units may require fluid changes and occasional servicing. Today, the W211 E 320 CDI remains a popular choice in the used car market, particularly for buyers seeking a fuel-efficient and comfortable long-distance cruiser. Its combination of luxury, performance, and reliability has ensured its continued appeal.
