The Mercedes-Benz S-Class Long (V221) S 320 CDI 4MATIC, produced from 2006 to 2009, represented a compelling blend of luxury, performance, and efficiency within the flagship S-Class range. Positioned as a mid-range offering in the long-wheelbase V221 generation, it catered to buyers seeking a sophisticated and spacious sedan with the benefits of all-wheel drive and a refined diesel powertrain. This variant was particularly popular in European markets where diesel engines held a significant market share, offering a balance between fuel economy and the S-Class’s renowned driving experience. The “Long” designation indicates an extended wheelbase, providing increased rear passenger legroom, a key feature for chauffeur-driven executives and those prioritizing rear-seat comfort.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | S-Class |
| Generation | S-Class Long (V221) |
| Type | S 320 CDI (235 Hp) 4MATIC 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) | 12-12.2 l/100 km (19.6 – 19.3 US mpg) |
| Fuel consumption (extra urban) | 7.1-7.3 l/100 km (33.1 – 32.2 US mpg) |
| Fuel consumption (combined) | 8.7-8.9 l/100 km (27 – 26.4 US mpg) |
| CO2 emissions | 227-231 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 7.8 sec |
| Acceleration 0 – 62 mph | 7.8 sec |
| Acceleration 0 – 60 mph | 7.4 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Weight-to-power ratio | 8.5 kg/Hp |
| Weight-to-torque ratio | 3.7 kg/Nm |
| Power | 235 Hp @ 3600 rpm |
| Torque | 540 Nm @ 1600-2400 rpm (398.28 lb.-ft. @ 1600-2400 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 642.930 |
| 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 | 18:1 |
| 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 | 7.5 l (7.93 US qt | 6.6 UK qt) |
| Kerb Weight | 1995 kg (4398.22 lbs.) |
| Max. weight | 2655 kg (5853.27 lbs.) |
| Max load | 660 kg (1455.05 lbs.) |
| Trunk (boot) space – minimum | 560 l (19.78 cu. ft.) |
| Fuel tank capacity | 90 l (23.78 US gal | 19.8 UK gal) |
| Length | 5209 mm (205.08 in.) |
| Width | 1872 mm (73.7 in.) |
| Width including mirrors | 2115 mm (83.27 in.) |
| Height | 1473 mm (57.99 in.) |
| Wheelbase | 3165 mm (124.61 in.) |
| Front track | 1604 mm (63.15 in.) |
| Rear (Back) track | 1606 mm (63.23 in.) |
| Front overhang | 871 mm (34.29 in.) |
| Rear overhang | 1173 mm (46.18 in.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 7 gears, automatic transmission G-TRONIC |
| Front suspension | Air suspension |
| Rear suspension | Air suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Tires size | 235/55 R17 |
| Wheel rims size | 8J x 17 |
Powertrain & Engine Architecture
The S 320 CDI 4MATIC was powered by the OM 642.930, a 3.0-liter V6 diesel engine. This engine was a cornerstone of Mercedes-Benz’s diesel offerings during this period, known for its robust construction and refined operation. It featured a common rail direct injection system, delivering fuel at extremely high pressure for optimized combustion and reduced emissions. A variable geometry turbocharger with an intercooler further enhanced performance and efficiency. The engine produced 235 horsepower at 3600 rpm and a substantial 540 Nm (398 lb-ft) of torque between 1600 and 2400 rpm. This torque output was a key characteristic, providing strong acceleration and effortless cruising. The engine utilized a double overhead camshaft (DOHC) valvetrain with four valves per cylinder. Paired with the engine was the 7G-TRONIC seven-speed automatic transmission, a sophisticated unit that offered smooth and responsive gear changes. The 4MATIC all-wheel-drive system distributed power to all four wheels, enhancing traction and stability, particularly in adverse weather conditions.
Driving Characteristics
The S 320 CDI 4MATIC offered a distinctly different driving experience compared to its gasoline-powered siblings, such as the S 350 or S 500. While lacking the outright acceleration of the larger engines, the diesel’s abundant torque provided strong and readily available power throughout the rev range. The 7G-TRONIC transmission was well-matched to the engine, providing seamless shifts and contributing to a relaxed driving experience. The gear ratios were optimized for both fuel efficiency and effortless highway cruising. Compared to a manual transmission equipped S-Class, the automatic offered greater convenience and ease of use, aligning with the luxury car’s target audience. The 4MATIC system provided a secure and planted feel, especially on slippery surfaces. The air suspension, standard on the S-Class, delivered a remarkably comfortable ride, absorbing bumps and imperfections in the road with ease.
Equipment & Trim Levels
The S 320 CDI 4MATIC came standard with a comprehensive array of luxury features. Interior appointments typically included leather upholstery, wood trim, and power-adjustable front seats with memory function. Standard equipment also included automatic climate control, a premium audio system, and a multi-function steering wheel. Optional extras were plentiful, including a panoramic sunroof, rear seat entertainment system, massaging seats, and advanced driver-assistance systems such as Distronic adaptive cruise control and Parktronic parking assist. The long wheelbase provided significantly more rear legroom than the standard-wheelbase S-Class, making it a popular choice for those who frequently traveled with passengers in the rear.
Chassis & Braking
The V221 S-Class featured an advanced chassis design focused on ride comfort and handling. The S 320 CDI 4MATIC utilized an air suspension system on both the front and rear axles, providing adjustable ride height and damping. This system allowed the car to adapt to varying road conditions and driving styles. The braking system consisted of ventilated discs at all four corners, providing ample stopping power. Anti-lock brakes (ABS) were standard, along with electronic stability control (ESP) to help maintain control in challenging situations. The suspension was tuned to prioritize comfort, but still offered a reasonably controlled and stable driving experience.
Market Reception & Comparison
The S 320 CDI 4MATIC was generally well-received by automotive critics. It was praised for its refined engine, comfortable ride, and spacious interior. The diesel engine’s fuel economy was a significant advantage, particularly in Europe where fuel prices were high. Compared to the S 350, the S 320 CDI offered similar levels of luxury and features, but with better fuel economy and a lower price point. However, some critics noted that the diesel engine was not as refined or powerful as the gasoline engines. Reliability was generally good, although diesel engines can be more susceptible to issues with the fuel injection system and particulate filters over time.
Legacy
The Mercedes-Benz S-Class Long (V221) S 320 CDI 4MATIC remains a desirable used car today, particularly for those seeking a luxurious and fuel-efficient sedan. The OM 642 engine, while requiring diligent maintenance, is known for its longevity. The 7G-TRONIC transmission is also generally reliable. However, potential buyers should be aware of the potential for issues with the air suspension system and the diesel particulate filter. The S 320 CDI 4MATIC represents a sweet spot in the V221 S-Class range, offering a compelling combination of luxury, performance, and efficiency at a relatively affordable price point.
