The Mercedes-Benz GLC 350d 4MATIC G-TRONIC, produced from October 2016 to May 2018, represents a compelling blend of luxury, performance, and efficiency within the X253 GLC SUV generation. Positioned as a mid-to-upper tier offering, this variant catered to buyers seeking a powerful diesel engine coupled with the convenience of an automatic transmission and all-wheel drive. It served as a key model in Mercedes-Benz’s strategy to offer a diverse range of powertrain options within the popular GLC lineup, appealing to both European and North American markets, though with a stronger emphasis on diesel acceptance in Europe.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | GLC |
| Generation | GLC SUV (X253) |
| Type | GLC 350d (258 Hp) 4MATIC G-TRONIC |
| Start of production | October, 2016 |
| End of production | May, 2018 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 7.2-6.8 l/100 km (32.7 – 34.6 US mpg) |
| Fuel consumption (extra urban) | 5.7-5.3 l/100 km (41.3 – 44.4 US mpg) |
| Fuel consumption (combined) | 6.2-5.9 l/100 km (37.9 – 39.9 US mpg) |
| CO2 emissions | 169-159 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 6.2 sec |
| Acceleration 0 – 62 mph | 6.2 sec |
| Acceleration 0 – 60 mph | 5.9 sec |
| Maximum speed | 238 km/h (147.89 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 7 kg/Hp, 142.1 Hp/tonne |
| Weight-to-torque ratio | 2.9 kg/Nm, 341.6 Nm/tonne |
| Power | 258 Hp @ 3400 rpm |
| Torque | 620 Nm @ 1600-2400 rpm (457.29 lb.-ft. @ 1600-2400 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 642 LS DE 30 LA / 642.873 |
| Engine displacement | 2987 cm3 (182.28 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | V-engine |
| Compression ratio | 15.5:1 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Engine oil capacity | 8 l (8.45 US qt | 7.04 UK qt) |
| Coolant capacity | 10 l (10.57 US qt | 8.8 UK qt) |
| Kerb Weight | 1815 kg (4001.39 lbs.) |
| Max. weight | 2500 kg (5511.56 lbs.) |
| Max load | 685 kg (1510.17 lbs.) |
| Trunk (boot) space – minimum | 550 l (19.42 cu. ft.) |
| Trunk (boot) space – maximum | 1600 l (56.5 cu. ft.) |
| Fuel tank capacity | 66 l (17.44 US gal | 14.52 UK gal) |
| Max. roof load | 75 kg (165.35 lbs.) |
| Permitted trailer load with brakes (12%) | 2500 kg (5511.56 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Length | 4656 mm (183.31 in.) |
| Width | 1890 mm (74.41 in.) |
| Width including mirrors | 2096 mm (82.52 in.) |
| Height | 1639 mm (64.53 in.) |
| Wheelbase | 2873 mm (113.11 in.) |
| Front track | 1621 mm (63.82 in.) |
| Rear track | 1617 mm (63.66 in.) |
| Front overhang | 831 mm (32.72 in.) |
| Rear overhang | 952 mm (37.48 in.) |
| Minimum turning circle | 11.80 m (38.71 ft.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears | 9 |
| Gearbox type | Automatic transmission G-TRONIC |
| Front suspension | Independent multi-link suspension |
| Rear suspension | Independent multi-link 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 | 235/65 R17 |
| Wheel rims size | 17 |
Powertrain & Engine Architecture
The GLC 350d 4MATIC utilizes the OM 642 LS DE 30 LA engine, a 3.0-liter V6 diesel engine. This engine, identified by the code 642.873, is a cornerstone of Mercedes-Benz’s diesel offerings. It features a sophisticated diesel commonrail direct injection system, delivering fuel at extremely high pressures for optimized combustion. The engine is turbocharged and intercooled, enhancing power and efficiency. The V6 configuration provides inherent smoothness and balance. The 9G-TRONIC nine-speed automatic transmission is paired with this engine. This transmission is known for its wide gear ratio spread, contributing to both fuel economy and responsive acceleration. The 4MATIC all-wheel-drive system provides enhanced traction and stability in various driving conditions, distributing torque between the front and rear axles as needed.
Driving Characteristics
The 258 horsepower and 457 lb-ft of torque produced by the 350d powertrain deliver strong and readily available performance. Acceleration from 0-60 mph is achieved in approximately 5.9 seconds, making it a brisk performer for a mid-size SUV. The 9G-TRONIC transmission contributes to a smooth and seamless driving experience, with well-spaced gear ratios that keep the engine in its optimal power band. Compared to the base 250d model, the 350d offers significantly more power and torque, resulting in noticeably quicker acceleration and more confident overtaking capabilities. While not as sporty as the AMG-tuned GLC 43, the 350d provides a refined and capable driving experience, well-suited for both daily commuting and long-distance travel.
Equipment & Trim Levels
The GLC 350d 4MATIC typically came well-equipped as standard. Features included automatic climate control, a high-resolution infotainment system with a central display screen, leather upholstery, power-adjustable front seats, and a suite of safety features such as adaptive brake assist, collision prevention assist, and crosswind assist. Optional extras included a panoramic sunroof, premium sound system, navigation system, and various driver assistance packages offering features like lane keeping assist and blind spot monitoring. Interior trim options varied, allowing buyers to personalize the cabin with different wood or aluminum accents.
Chassis & Braking
The GLC 350d features an independent multi-link suspension at both the front and rear axles, providing a comfortable and controlled ride. The suspension is tuned to balance ride comfort with handling precision. Braking duties are handled by ventilated discs on all four wheels, providing ample stopping power. The ABS (Anti-lock Braking System) and Electronic Stability Program (ESP) enhance safety by preventing wheel lockup and maintaining vehicle stability during emergency braking maneuvers. The 350d variant typically featured slightly stiffer suspension components compared to lower-powered models to better manage the increased weight and performance.
Market Reception & Comparison
The GLC 350d 4MATIC was generally well-received by automotive critics. It was praised for its powerful and efficient engine, comfortable ride, and luxurious interior. Compared to the GLC 250d, the 350d offered a significant performance upgrade, justifying the higher price tag for buyers prioritizing power and acceleration. Fuel economy was also a strong point, with the diesel engine delivering impressive mileage for its class. However, some critics noted that the ride could be slightly firm on rough roads, and the infotainment system, while feature-rich, could be complex to navigate.
Legacy
The OM 642 engine family, including the version used in the GLC 350d, has a reputation for durability and reliability when properly maintained. While diesel engines generally require more diligent maintenance than gasoline engines, the OM 642 is known for its robust construction and longevity. In the used car market, the GLC 350d 4MATIC remains a desirable option for buyers seeking a luxurious and capable SUV with strong fuel economy. However, potential buyers should be aware of the potential for diesel particulate filter (DPF) issues, particularly if the vehicle has been primarily used for short trips. Regular servicing and the use of high-quality diesel fuel are essential for maintaining the long-term reliability of this powertrain.
