The Mercedes-Benz S-Class Long (V222) S 320 V6, produced from 2014 to 2017, represented a compelling entry point into the flagship S-Class range, particularly in markets where the long-wheelbase variant was favored for its increased rear passenger space. Positioned below the S 500 and other higher-performance models, the S 320 aimed to deliver a luxurious experience with a balance of efficiency and respectable performance. It was a key offering within the V222 generation, which introduced a significant leap forward in technology, safety, and comfort for the brand. The “Long” designation indicates an extended wheelbase, adding approximately 130mm to the standard S-Class, almost entirely benefiting rear legroom.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | S-class |
| Generation | S-class Long (V222) |
| Type (Engine) | S 320 V6 (272 Hp) 7G-TRONIC PLUS |
| Start of production | 2014 |
| End of production | 2017 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 4 |
| Doors | 4 |
| Fuel consumption (combined) | 8 l/100 km |
| Fuel consumption (US mpg) | 29.4 US mpg |
| Fuel consumption (UK mpg) | 35.3 UK mpg |
| Fuel consumption (km/l) | 12.5 km/l |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 7.1 sec |
| Acceleration 0 – 62 mph | 7.1 sec |
| Acceleration 0 – 60 mph | 6.7 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Power | 272 Hp @ 5000 rpm |
| Power per litre | 90.8 Hp/l |
| Torque | 400 Nm @ 1300-4500 rpm (295.02 lb.-ft. @ 1300-4500 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M 276 |
| Engine displacement | 2996 cm3 (182.83 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | V-engine |
| Cylinder Bore | 88 mm (3.46 in.) |
| Piston Stroke | 82.1 mm (3.23 in.) |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Twin-Turbo, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 6.5 l (6.87 US qt | 5.72 UK qt) |
| Length | 5250 mm (206.69 in.) |
| Width | 1899 mm (74.76 in.) |
| Width including mirrors | 2130 mm (83.86 in.) |
| Height | 1494 mm (58.82 in.) |
| Wheelbase | 3165 mm (124.61 in.) |
| Front track | 1634 mm (64.33 in.) |
| Rear track | 1632 mm (64.25 in.) |
| Front overhang | 892 mm (35.12 in.) |
| Rear overhang | 1193 mm (46.97 in.) |
| Drivetrain Architecture | Rear wheel drive |
| Number of gears and type of gearbox | 7 gears, automatic transmission 7G-TRONIC PLUS |
| Front suspension | Independent multi-link suspension, Air suspension |
| Rear suspension | Independent multi-link suspension, Air suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 245/50 R18 |
| Wheel rims size | 8J x 18 |
Powertrain & Engine Architecture
The S 320 V6 was powered by the M276 engine, a 3.0-liter (2996 cc) V6 engine featuring direct injection and twin-turbocharging. This engine was a cornerstone of Mercedes-Benz’s modular engine family, known for its smooth operation and relatively efficient power delivery. The twin-turbochargers, strategically positioned, minimized turbo lag and provided a broad torque curve. The engine utilized a double overhead camshaft (DOHC) valvetrain with four valves per cylinder, optimizing gas flow for improved performance. The 7G-TRONIC PLUS automatic transmission, a seven-speed unit, was specifically tuned to complement the engine’s characteristics. This transmission offered smooth and responsive shifts, contributing to a refined driving experience. The Start & Stop system was standard, further enhancing fuel efficiency in urban driving conditions.
Driving Characteristics
The S 320 V6 offered a comfortable and composed driving experience, prioritizing smoothness over outright performance. While 272 horsepower and 400 Nm (295 lb-ft) of torque weren’t groundbreaking figures, the engine provided ample power for effortless cruising and confident overtaking. Acceleration from 0 to 60 mph took approximately 6.7 seconds, which was respectable for a large luxury sedan. The 7G-TRONIC PLUS transmission played a crucial role in maximizing the engine’s output, with well-chosen gear ratios ensuring the engine remained within its optimal power band. Compared to the S 500 with its V8 engine, the S 320 felt less urgent in its acceleration, but it offered a more fuel-efficient alternative without sacrificing a significant amount of refinement. The air suspension provided a remarkably smooth ride, effectively isolating passengers from road imperfections.
Equipment & Trim Levels
The S 320 Long came standard with a comprehensive array of luxury features. Interior appointments typically included high-quality leather upholstery, wood trim, and brushed aluminum accents. Standard equipment included automatic climate control, a premium sound system, power-adjustable front seats with memory function, and a multi-function steering wheel. The infotainment system featured a large central display screen and Mercedes-Benz’s COMAND interface. Optional extras included features like a panoramic sunroof, rear seat entertainment system, massaging seats, and advanced driver-assistance systems such as adaptive cruise control and lane-keeping assist. The long wheelbase provided significantly more rear legroom, making it a popular choice for chauffeur-driven applications.
Chassis & Braking
The S-Class Long (V222) utilized an independent multi-link suspension system at both the front and rear axles, coupled with Mercedes-Benz’s AIRMATIC air suspension. This combination delivered a supremely comfortable ride and excellent handling characteristics. The air suspension allowed for adjustable ride height and damping settings, further enhancing versatility. Braking duties were handled by ventilated disc brakes on all four wheels, providing ample stopping power. The inclusion of ABS (Anti-lock Braking System) and electronic stability control ensured safe and controlled braking performance in various conditions. The steering system employed a rack-and-pinion setup with electric power assistance, offering precise and responsive steering feel.
Market Reception & Comparison
The S 320 V6 was generally well-received by automotive critics as a sensible and luxurious option within the S-Class range. It was praised for its comfortable ride, refined interior, and relatively fuel-efficient engine. However, some reviewers noted that its performance wasn’t as exhilarating as that of the higher-powered S 500 models. Compared to the S 350 BlueTEC diesel variant, the S 320 offered a slightly more responsive engine but lacked the diesel’s exceptional fuel economy. In terms of reliability, the M276 engine proved to be generally robust, although preventative maintenance, particularly regarding the timing chain, was crucial to avoid potential issues.
Legacy
The Mercedes-Benz S-Class Long (V222) S 320 V6 has established itself as a desirable used luxury car. Its combination of comfort, technology, and reasonable running costs makes it an attractive option for buyers seeking a prestigious sedan. While not the fastest or most exclusive S-Class variant, it represents a sweet spot in the lineup, offering a well-rounded package that delivers a true Mercedes-Benz experience. The M276 engine, when properly maintained, continues to provide reliable service, and parts availability remains good. The S 320 Long’s enduring appeal lies in its ability to provide a luxurious and comfortable ride without the exorbitant price tag of its more powerful siblings.
