The Mercedes-Benz S 350d Long (V222) represents a significant iteration of the flagship S-Class sedan, produced from February 2016 to May 2017. Positioned as a diesel-powered variant within the extended-wheelbase V222 generation, it aimed to deliver a blend of luxury, performance, and efficiency, particularly appealing to markets where diesel engines were favored for long-distance travel. This model occupied a middle ground in the S-Class lineup, offering a more economical alternative to the petrol-powered S 500 and S 63 AMG, while still providing the opulent experience expected of the S-Class nameplate. The “Long” designation indicates an extended wheelbase, prioritizing rear passenger space and comfort.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | S-class |
| Generation | S-class Long (V222) |
| Type (Engine) | S 350d V6 (258 Hp) 9G-TRONIC |
| Start of production | February, 2016 |
| End of production | May, 2017 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 4 |
| Doors | 4 |
| Fuel consumption (economy) – urban (NEDC) | 6.7-7 l/100 km (35.1 – 33.6 US mpg, 42.2 – 40.4 UK mpg, 14.9 – 14.3 km/l) |
| Fuel consumption (economy) – extra urban (NEDC) | 4.9-5.5 l/100 km (48 – 42.8 US mpg, 57.6 – 51.4 UK mpg, 20.4 – 18.2 km/l) |
| Fuel consumption (economy) – combined (NEDC) | 5.4-6 l/100 km (43.6 – 39.2 US mpg, 52.3 – 47.1 UK mpg, 18.5 – 16.7 km/l) |
| CO2 emissions (NEDC) | 141-157 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 6.5 sec |
| Acceleration 0 – 62 mph | 6.5 sec |
| Acceleration 0 – 60 mph | 6.2 sec |
| Maximum speed | 250 km/h (155.34 mph), Electronically limited |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 7.4 kg/Hp, 135.8 Hp/tonne |
| Weight-to-torque ratio | 3.1 kg/Nm, 326.3 Nm/tonne |
| Power | 258 Hp @ 3400 rpm |
| Power per litre | 86.4 Hp/l |
| Torque | 620 Nm @ 1600-2400 rpm (457.29 lb.-ft. @ 1600-2400 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 642.861 |
| 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 | 15.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 8 l (8.45 US qt | 7.04 UK qt) |
| Coolant | 11.6 l (12.26 US qt | 10.21 UK qt) |
| Kerb Weight | 1900 kg (4188.78 lbs.) |
| Max. weight | 2690 kg (5930.43 lbs.) |
| Max load | 790 kg (1741.65 lbs.) |
| Trunk (boot) space – minimum | 510 l (18.01 cu. ft.) |
| Fuel tank capacity | 70 l (18.49 US gal | 15.4 UK gal) |
| AdBlue tank | 25.5 l (6.74 US gal | 5.61 UK gal) |
| Max. roof load | 100 kg (220.46 lbs.) |
| Permitted trailer load with brakes (12%) | 2100 kg (4629.71 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 85 kg (187.39 lbs.) |
| Length | 5246 mm (206.54 in.) |
| Width | 1899 mm (74.76 in.) |
| Width including mirrors | 2130 mm (83.86 in.) |
| Height | 1497 mm (58.94 in.) |
| Wheelbase | 3165 mm (124.61 in.) |
| Front track | 1624 mm (63.94 in.) |
| Rear (Back) track | 1637 mm (64.45 in.) |
| Front overhang | 888 mm (34.96 in.) |
| Rear overhang | 1193 mm (46.97 in.) |
| Drag coefficient (Cd) | 0.24 |
| Minimum turning circle (turning diameter) | 12.3 m (40.35 ft.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the rear wheels of the vehicle. |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 9 gears, 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 | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | Front wheel tires: 245/55 R17; 245/50 R18; 245/45 R19; 245/40 R20Rear wheel tires: 245/55 R17; 245/50 R18; 275/40 R19; 275/35 R20 |
| Wheel rims size | Front wheel rims: 8J x 17; 8J x 18; 8.5J x 19; 8.5J x 20Rear wheel rims: 8J x 17; 8.5J x 18; 9.5J x 19; 9.5J x 20 |
Powertrain & Engine Architecture
The S 350d Long is powered by the OM 642.861 3.0-liter V6 diesel engine. This engine is a hallmark of Mercedes-Benz diesel technology, featuring a robust cast iron block and aluminum cylinder heads. It utilizes a sophisticated common-rail direct injection system, delivering fuel at extremely high pressures for optimized combustion. A single turbocharger with an intercooler provides forced induction, contributing to the engine’s 258 horsepower at 3400 rpm and a substantial 620 Nm (457 lb-ft) of torque available from 1600-2400 rpm. The engine also incorporates a Start & Stop system and a particulate filter to reduce emissions, meeting Euro 6 standards. Paired with the engine is the 9G-TRONIC nine-speed automatic transmission. This transmission is known for its smooth shifts and wide gear ratio spread, contributing to both fuel efficiency and refined driving experience.
Driving Characteristics
The 9G-TRONIC transmission plays a crucial role in the S 350d’s driving experience. The close gear ratios keep the engine within its optimal torque band, providing strong acceleration without excessive engine revving. While not as overtly sporty as the petrol-powered S-Class models, the S 350d delivers a confident 0-60 mph time of around 6.2 seconds. The long wheelbase and air suspension contribute to a remarkably comfortable ride, absorbing road imperfections effectively. The rear-wheel drive configuration provides a balanced feel, although it doesn’t offer the all-weather capability of the 4MATIC all-wheel drive system available on other S-Class variants. Compared to the S 500, the S 350d prioritizes fuel economy and relaxed cruising over outright performance.
Equipment & Trim Levels
The S 350d Long typically came well-equipped, reflecting its position as a luxury flagship. Standard features included leather upholstery, heated and ventilated front seats with massage functions, a premium sound system, a large infotainment screen with navigation, and a comprehensive suite of driver-assistance systems such as adaptive cruise control, lane-keeping assist, and automatic emergency braking. Optional extras included rear-seat entertainment, a panoramic sunroof, upgraded leather options, and various customization packages. The interior design emphasized elegance and sophistication, with high-quality materials and meticulous attention to detail.
Chassis & Braking
The S 350d Long features an independent multi-link suspension at both the front and rear, enhanced by Mercedes-Benz’s AIRMATIC air suspension system. This system automatically adjusts the suspension damping and ride height to optimize comfort and handling. Ventilated disc brakes are fitted on all four wheels, providing ample stopping power. The electronic stability program (ESP) and anti-lock braking system (ABS) are standard, enhancing safety and control. The suspension tuning is geared towards comfort, prioritizing a smooth and composed ride over aggressive handling.
Market Reception & Comparison
The S 350d Long was generally well-received by automotive critics, who praised its refined ride, luxurious interior, and impressive fuel economy. It was seen as a compelling alternative to petrol-powered S-Class models, particularly for drivers who frequently undertake long journeys. Compared to the S 500, the S 350d offered similar levels of luxury and technology at a lower price point, albeit with slightly less performance. The S 350d also offered better fuel economy than the S 500, making it a more economical choice for high-mileage drivers. Reliability reports suggest that the OM 642 engine is generally robust, although maintenance costs can be higher than for petrol engines due to the complexity of the diesel injection system and particulate filter.
Legacy
The Mercedes-Benz S 350d Long (V222) remains a desirable used car, appreciated for its blend of luxury, comfort, and efficiency. The OM 642 engine, while requiring diligent maintenance, is known for its longevity. The 9G-TRONIC transmission has also proven to be reliable. However, potential buyers should be aware of the potential costs associated with diesel particulate filter maintenance and the complexity of the common-rail injection system. The V222 S-Class, including the 350d variant, represents a high point in Mercedes-Benz engineering and continues to offer a sophisticated and comfortable driving experience.
