The Mercedes-Benz X 350d V6 4MATIC Automatic was a top-of-the-line variant of the X-Class mid-size pickup truck, produced from 2018 to May 2020. Representing the most powerful engine option available for the X-Class, it aimed to blend the practicality of a pickup with the luxury and refinement typically associated with the Mercedes-Benz brand. The X 350d V6 occupied the premium segment of the pickup market, targeting buyers who desired a vehicle capable of both work and leisure, with a higher level of comfort and performance than traditionally offered in this class. It was built on a shared platform with the Nissan Navara, but significantly differentiated itself through its interior appointments, engine choice, and overall driving experience.
Powertrain & Engine Architecture
The heart of the X 350d V6 is the OM 642.889 3.0-liter turbocharged diesel V6 engine. This engine, a well-established design within the Mercedes-Benz portfolio, produces 258 horsepower at 3400 rpm and a substantial 550 Nm (405.66 lb-ft) of torque between 1400 and 3200 rpm. The engine features a diesel commonrail fuel injection system, ensuring precise fuel delivery for optimal combustion and efficiency. It also incorporates a turbocharger with an intercooler to boost power output. The engine is longitudinally mounted in the chassis, a configuration contributing to the vehicle’s balanced handling characteristics. The V6 configuration itself provides inherent smoothness compared to inline engines.
Power is transmitted to all four wheels via a 7G-TRONIC PLUS seven-speed automatic transmission. This transmission is known for its smooth and responsive shifts, and its ability to adapt to varying driving conditions. The 4MATIC all-wheel-drive system offers selectable modes, including 4H (high range), 4L (low range), and an automatic mode that intelligently distributes torque between the front and rear axles based on available traction. The transmission’s gear ratios are tuned to balance acceleration with fuel efficiency, providing adequate power for both on-road cruising and off-road capability.
Engine Specifications
The OM 642.889 engine boasts a displacement of 2987 cm3 (182.28 cu. in.) and features 4 valves per cylinder. It is equipped with a particulate filter to meet stringent Euro 6 emission standards. The engine requires 8.5 liters (8.98 US qt | 7.48 UK qt) of engine oil, specified to Mercedes-Benz standards, and a coolant capacity of 10 liters (10.57 US qt | 8.8 UK qt).
Driving Characteristics
The X 350d V6 delivers a noticeably more refined and powerful driving experience compared to the lower-powered four-cylinder variants of the X-Class. The V6 engine provides ample torque across a wide rev range, making it well-suited for towing and hauling heavy loads. Acceleration from 0 to 100 km/h (0-62 mph) takes 7.9 seconds, and 0-60 mph is achieved in approximately 7.5 seconds. The 7G-TRONIC PLUS transmission contributes to smooth and seamless gear changes, enhancing overall driving comfort. The 4MATIC system provides excellent traction in various conditions, making the X 350d V6 capable both on and off-road. While not a dedicated off-roader, it offers significantly improved capability compared to standard pickups. The longitudinal engine layout and well-tuned suspension contribute to stable and predictable handling.
Equipment & Trim Levels
The X 350d V6 was typically offered in higher trim levels, featuring a more luxurious interior than the base models. Standard equipment often included leather upholstery, heated front seats, a premium infotainment system with navigation, and a suite of driver-assistance features such as lane keeping assist and adaptive cruise control. Optional extras included a panoramic sunroof, upgraded sound system, and various styling enhancements. The dashboard layout was designed to reflect the Mercedes-Benz aesthetic, with high-quality materials and a focus on ergonomics. Interior color schemes were typically more sophisticated than those found in work-oriented pickups.
Chassis & Braking
The X 350d V6 utilizes a robust chassis designed to handle the increased power and torque of the V6 engine. The suspension system consists of independent double wishbones at the front and leaf springs at the rear. The rear leaf springs are a carryover from the Nissan Navara platform, but were tuned by Mercedes-Benz engineers to provide a more comfortable ride. Braking is handled by ventilated discs on all four wheels, providing ample stopping power. The X 350d V6 is equipped with ABS (Anti-lock braking system) and electronic stability control as standard safety features. Steering is rack and pinion with electric power assistance.
Market Reception & Comparison
The Mercedes-Benz X 350d V6 received mixed reviews from automotive critics. While praised for its refined interior, powerful engine, and comfortable ride, it was often criticized for its high price point, which positioned it significantly above traditional pickup trucks. Compared to the X 220d and X 250d variants, the X 350d V6 offered a substantial performance upgrade, but at a considerable cost. Fuel economy was respectable for a vehicle of its size and capability, with combined fuel consumption of 9 l/100 km (26.1 US mpg, 31.4 UK mpg). Reliability reports were generally positive, although the complexity of the engine and transmission could potentially lead to higher maintenance costs over the long term. The X 350d V6 aimed to compete with premium pickup trucks like the Ford Ranger Raptor, but often fell short in terms of outright off-road performance.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | X-class |
| Generation | X-class |
| Type (Engine) | X 350d V6 (258 Hp) 4MATIC Automatic |
| Start of production | 2018 |
| End of production | May, 2020 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 10.2 l/100 km (23.1 US mpg) |
| Fuel consumption (extra urban) | 8.3 l/100 km (28.3 US mpg) |
| Fuel consumption (combined) | 9 l/100 km (26.1 US mpg) |
| CO2 emissions | 237 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 7.9 sec |
| Acceleration 0 – 62 mph | 7.9 sec |
| Acceleration 0 – 60 mph | 7.5 sec |
| Maximum speed | 205 km/h (127.38 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 8.8 kg/Hp |
| Weight-to-torque ratio | 4.1 kg/Nm |
| Power | 258 Hp @ 3400 rpm |
| Torque | 550 Nm @ 1400-3200 rpm (405.66 lb.-ft.) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 642.889 |
| 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 oil capacity | 8.5 l (8.98 US qt | 7.48 UK qt) |
| Coolant | 10 l (10.57 US qt | 8.8 UK qt) |
| Kerb Weight | 2259 kg (4980.24 lbs.) |
| Max. weight | 3250 kg (7165.02 lbs.) |
| Max load | 991 kg (2184.78 lbs.) |
| Fuel tank capacity | 73 l (19.28 US gal | 16.06 UK gal) |
| Length | 5340 mm (210.24 in.) |
| Width | 1920 mm (75.59 in.) |
| Height | 1819 mm (71.61 in.) |
| Wheelbase | 3150 mm (124.02 in.) |
| Tires size | 255/65 R17; 255/60 R18; 255/55 R19 |
| Number of gears and type of gearbox | 7 gears, automatic transmission G-TRONICPLUS |
Legacy
The Mercedes-Benz X-Class, including the X 350d V6 variant, was discontinued after a relatively short production run due to disappointing sales figures. While the X 350d V6 offered a compelling combination of power, luxury, and capability, its high price and limited practicality ultimately hindered its success in the competitive pickup truck market. On the used car market, the X 350d V6 remains a relatively rare and sought-after vehicle, particularly among those seeking a unique and well-equipped pickup truck. The OM 642.889 engine is known for its durability and reliability, provided it has been properly maintained. However, potential buyers should be aware of the potential for higher maintenance costs associated with the complex engine and transmission. The X 350d V6 represents an ambitious, though ultimately unsuccessful, attempt by Mercedes-Benz to enter the premium pickup truck segment.
