The Mercedes-Benz E 320 CDI 4MATIC, produced between 2005 and 2006, represented a compelling blend of performance, efficiency, and all-weather capability within the W211 E-Class range. Positioned as a mid-to-upper tier offering, it catered to buyers seeking a luxurious sedan with strong diesel torque and the added security of Mercedes-Benz’s 4MATIC all-wheel drive system. This variant utilized a sophisticated common-rail diesel injection system and a five-speed automatic transmission, aiming to deliver a refined driving experience. It was a key model during a period where Mercedes-Benz was solidifying its reputation for advanced diesel technology in the North American market, though the E-Class remained primarily a European success story.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | E-class |
| Generation | E-class (W211) |
| Type (Engine) | E 320 CDI V6 (224 Hp) 4MATIC 5G-TRONIC |
| Start of production | 2005 |
| End of production | 2006 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 10.5 l/100 km (22.4 US mpg, 26.9 UK mpg, 9.5 km/l) |
| Fuel consumption (extra urban) | 6.4 l/100 km (36.8 US mpg, 44.1 UK mpg, 15.6 km/l) |
| Fuel consumption (combined) | 7.9 l/100 km (29.8 US mpg, 35.8 UK mpg, 12.7 km/l) |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 7.4 sec |
| Acceleration 0 – 62 mph | 7.4 sec |
| Acceleration 0 – 60 mph | 7 sec |
| Maximum speed | 244 km/h (151.61 mph) |
| Emission standard | Euro 4 |
| Weight-to-power ratio | 8.2 kg/Hp, 122.1 Hp/tonne |
| Weight-to-torque ratio | 3.6 kg/Nm, 277.9 Nm/tonne |
| Power | 224 Hp @ 3800 rpm |
| Power per litre | 75 Hp/l |
| Torque | 510 Nm @ 1600 rpm (376.16 lb.-ft. @ 1600 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 642.921 |
| Engine displacement | 2987 cm3 (182.28 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | V-engine |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Engine oil capacity | 8.5 l (8.98 US qt | 7.48 UK qt) |
| Coolant capacity | 7.5 l (7.93 US qt | 6.6 UK qt) |
| Kerb Weight | 1835 kg (4045.48 lbs.) |
| Max. weight | 2360 kg (5202.91 lbs.) |
| Max load | 525 kg (1157.43 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 (12%) | 1900 kg (4188.78 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Length | 4818 mm (189.69 in.) |
| Width | 1822 mm (71.73 in.) |
| Height | 1452 mm (57.17 in.) |
| Wheelbase | 2854 mm (112.36 in.) |
| Front track | 1577 mm (62.09 in.) |
| Rear (Back) track | 1570 mm (61.81 in.) |
| Drag coefficient (Cd) | 0.29 |
| Minimum turning circle (turning diameter) | 11.4 m (37.4 ft.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 5 gears, automatic transmission |
| Front suspension | Double wishbone |
| Rear suspension | Independent multi-link spring suspension with 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 |
| Tires size | 225/55 R16 |
| Wheel rims size | 16 |
Powertrain & Engine Architecture
The heart of the E 320 CDI 4MATIC is the OM 642.921, a 3.0-liter V6 diesel engine. This engine is a significant departure from earlier inline-six diesel designs, offering improved refinement and power delivery. It features a 60-degree V-angle, contributing to a more compact engine bay layout. The engine utilizes a second-generation common rail direct injection system, operating at pressures up to 1600 bar, for precise fuel metering and optimized combustion. A variable geometry turbocharger (VGT) with an intercooler further enhances performance by boosting intake air density. The valvetrain employs three valves per cylinder (two intake, one exhaust) to improve breathing and efficiency. The 5G-TRONIC automatic transmission, a five-speed unit, was specifically calibrated to work with the high torque output of the diesel engine. It features adaptive shift programming, adjusting shift points based on driving style and road conditions.
Driving Characteristics
The E 320 CDI 4MATIC offered a distinctly different driving experience compared to its gasoline-powered siblings. The substantial 510 Nm (376 lb-ft) of torque, available from a low 1600 rpm, provided effortless acceleration and strong pulling power, particularly useful for highway overtaking and towing. While not as outright quick as the E 350 or E 500 models, the diesel delivered a more relaxed and confident feel. The 5G-TRONIC transmission, while smooth, could sometimes feel hesitant during downshifts, especially in demanding situations. The 4MATIC all-wheel drive system provided excellent traction in adverse weather conditions, enhancing stability and control. The gear ratios were tuned for fuel efficiency and relaxed cruising, rather than aggressive acceleration.
Equipment & Trim Levels
The E 320 CDI 4MATIC typically came well-equipped, reflecting its position in the E-Class lineup. Standard features included leather upholstery, automatic climate control, power-adjustable front seats with memory function, a multi-function steering wheel, and a premium audio system. Optional extras included a sunroof, navigation system, upgraded leather packages, and parking assist systems. The interior trim was generally executed with high-quality materials, emphasizing a luxurious and comfortable cabin environment. The exterior styling was consistent with other W211 E-Class models, featuring a classic and understated Mercedes-Benz design.
Chassis & Braking
The W211 E-Class chassis featured a sophisticated suspension setup designed for both comfort and handling. The E 320 CDI 4MATIC utilized a double wishbone front suspension and an independent multi-link rear suspension with a stabilizer bar. This configuration provided a smooth ride and controlled body roll. The braking system consisted of ventilated discs at the front and solid discs at the rear, coupled with ABS (Anti-lock Braking System) and Electronic Stability Program (ESP) for enhanced safety. The 4MATIC system distributed power to all four wheels, improving traction and stability, particularly on slippery surfaces.
Market Reception & Comparison
The E 320 CDI 4MATIC was generally well-received by automotive critics, who praised its fuel efficiency, strong torque, and comfortable ride. However, some reviewers noted the slightly hesitant behavior of the 5G-TRONIC transmission and the engine’s relatively noisy operation compared to gasoline engines. Compared to the E 350, the CDI offered superior fuel economy and low-end torque, but lacked the same level of outright performance. Against the E 280, it provided a significant power upgrade, but at a higher price point. The E 320 CDI was often seen as a practical and sensible choice for buyers prioritizing efficiency and all-weather capability.
Legacy
The OM 642 engine family, including the 3.0-liter variant found in the E 320 CDI, proved to be remarkably durable and reliable. Properly maintained examples continue to provide dependable service today. The 5G-TRONIC transmission, while not without its quirks, is generally considered robust. However, like all diesel engines, the E 320 CDI requires regular maintenance, including oil changes and fuel filter replacements. In the used car market, these models are often sought after by buyers looking for a comfortable, fuel-efficient, and capable luxury sedan. The combination of a strong diesel engine, all-wheel drive, and a well-appointed interior makes the E 320 CDI 4MATIC a compelling option for those seeking a refined and practical vehicle.
