The Mercedes-Benz S-Class Long (V220 facelift), produced from 2002 to 2005, represented a significant evolution of the flagship S-Class sedan. The S 320 CDI, equipped with a 3.2-liter turbocharged diesel engine and the 5G-TRONIC automatic transmission, was a key variant within the range, particularly in European markets where diesel engines held a strong preference. This long-wheelbase version offered enhanced rear passenger space, catering to those prioritizing luxury and comfort. It sat in the mid-range of the S-Class lineup, offering a balance between performance, economy, and refinement, positioned below the more powerful S 430 and S 500 models, but above the entry-level S 280.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | S-Class |
| Generation | S-Class Long (V220, facelift 2002) |
| Type (Engine) | S 320 CDI (204 Hp) 5G-TRONIC |
| Start of production | October, 2002 |
| End of production | July, 2005 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 11 l/100 km (21.4 US mpg, 25.7 UK mpg, 9.1 km/l) |
| Fuel consumption (extra urban) | 5.8 l/100 km (40.6 US mpg, 48.7 UK mpg, 17.2 km/l) |
| Fuel consumption (combined) | 7.7 l/100 km (30.5 US mpg, 36.7 UK mpg, 13 km/l) |
| CO2 emissions | 204 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 8.2 sec |
| Acceleration 0 – 62 mph | 8.2 sec |
| Acceleration 0 – 60 mph | 7.8 sec |
| Maximum speed | 235 km/h (146.02 mph) |
| Emission standard | Euro 3 |
| Weight-to-power ratio | 9.2 kg/Hp, 108.8 Hp/tonne |
| Weight-to-torque ratio | 3.8 kg/Nm, 266.7 Nm/tonne |
| Power | 204 Hp @ 4200 rpm |
| Power per litre | 63.3 Hp/l |
| Torque | 500 Nm @ 1800-2600 rpm (368.78 lb.-ft. @ 1800-2600 rpm) |
| Maximum engine speed | 4560 rpm |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 648.960 |
| Engine displacement | 3222 cm3 (196.62 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 88 mm (3.46 in.) |
| Piston Stroke | 88.4 mm (3.48 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 | 15.5 l (16.38 US qt | 13.64 UK qt) |
| Kerb Weight | 1875 kg (4133.67 lbs.) |
| Max. weight | 2475 kg (5456.44 lbs.) |
| Max load | 600 kg (1322.77 lbs.) |
| Trunk (boot) space (minimum) | 500 l (17.66 cu. ft.) |
| Fuel tank capacity | 88 l (23.25 US gal | 19.36 UK gal) |
| Max. roof load | 100 kg (220.46 lbs.) |
| Length | 5163 mm (203.27 in.) |
| Width | 1855 mm (73.03 in.) |
| Width including mirrors | 2105 mm (82.87 in.) |
| Height | 1444 mm (56.85 in.) |
| Wheelbase | 3085 mm (121.46 in.) |
| Front track | 1574 mm (61.97 in.) |
| Rear track | 1574 mm (61.97 in.) |
| Front overhang | 872 mm (34.33 in.) |
| Rear overhang | 1206 mm (47.48 in.) |
| Drag coefficient (Cd) | 0.28 |
| Minimum turning circle | 12.1 m (39.7 ft.) |
| Drivetrain Architecture | Rear wheel drive |
| Drive wheel | Rear wheel drive |
| Number of gears | 5 |
| Gearbox type | Automatic transmission G-TRONIC |
| Front suspension | Independent multi-link suspension, Transverse stabilizer, Air suspension |
| Rear suspension | Independent multi-link suspension, Air suspension, Transverse 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 | 225/60 R16 |
| Wheel rims size | 7.5J x 16 |
Powertrain & Engine Architecture
The heart of the S 320 CDI is the OM 648.960, a 3.2-liter inline-six cylinder diesel engine. This engine utilized common rail direct injection, a technology that allowed for precise fuel delivery and improved combustion efficiency. A variable geometry turbocharger with an intercooler further enhanced performance, delivering strong torque across a broad rev range. The engine featured a double overhead camshaft (DOHC) valvetrain with four valves per cylinder. The 5G-TRONIC automatic transmission, a five-speed unit, was specifically tuned to complement the engine’s characteristics, prioritizing smooth shifts and fuel efficiency. This transmission offered a manual shift mode for greater driver control, though it wasn’t as responsive as later iterations.
Driving Characteristics
The S 320 CDI offered a distinctly different driving experience compared to its gasoline-powered siblings. While lacking the outright acceleration of the S 430 or S 500, the CDI delivered a substantial 500 Nm (368 lb-ft) of torque from as low as 1800 rpm. This resulted in effortless cruising and strong mid-range acceleration, making it well-suited for long-distance journeys. The 5G-TRONIC transmission, while smooth, could feel somewhat hesitant when downshifting for quick overtaking maneuvers. The long wheelbase and air suspension provided a supremely comfortable ride, isolating passengers from road imperfections. The steering was light and precise, contributing to a relaxed driving experience.
Equipment & Trim Levels
The S 320 CDI Long came standard with a comprehensive array of luxury features, befitting its flagship status. These included leather upholstery, wood trim, automatic climate control, power-adjustable front seats with memory function, and a premium audio system. Optional extras included a rear entertainment system, massaging seats, a panoramic sunroof, and advanced driver-assistance systems like Distronic adaptive cruise control. The interior design was characterized by its understated elegance and high-quality materials. The long wheelbase provided ample rear legroom, enhancing passenger comfort.
Chassis & Braking
The S-Class Long featured an independent multi-link suspension at both the front and rear, coupled with an air suspension system. This combination provided a remarkably smooth and controlled ride. The front suspension incorporated a transverse stabilizer bar to reduce body roll. Braking duties were handled by ventilated discs at the front and solid discs at the rear, assisted by ABS (Anti-lock Braking System). The hydraulic power steering offered precise and effortless steering control.
Market Reception & Comparison
The S 320 CDI was particularly well-received in Europe, where diesel engines were favored for their fuel efficiency and torque. Critics praised its comfortable ride, refined interior, and strong performance. Compared to the S 430, the CDI offered comparable fuel economy but slightly slower acceleration. However, the CDI’s lower purchase price and strong torque made it an attractive alternative for those prioritizing practicality and value. The S 280, the entry-level model, offered lower running costs but lacked the CDI’s performance and refinement.
Legacy
The OM 648 engine family, including the 3.2-liter variant found in the S 320 CDI, proved to be generally reliable, although early common rail systems could be prone to injector issues. With proper maintenance, these engines can accumulate high mileage. Today, the S 320 CDI Long represents a compelling value proposition in the used luxury car market. It offers a blend of comfort, refinement, and fuel efficiency that remains competitive even by modern standards. However, potential buyers should be aware of the age-related maintenance requirements associated with a vehicle of this era, including potential issues with the air suspension and electronic systems.
