The Mercedes-Benz GL 350 BlueTEC 4MATIC, produced between 2012 and 2015 as part of the X166 GL-Class generation, represented a compelling blend of luxury, capability, and diesel efficiency in the full-size SUV segment. Positioned as a mid-range offering within the GL lineup – sandwiched between the GL 550 and the entry-level GL 450 – the 350 BlueTEC appealed to buyers seeking a powerful and refined vehicle with superior fuel economy compared to its gasoline counterparts. This variant was primarily marketed in North America and Europe, catering to customers who desired a spacious, seven-passenger SUV capable of towing substantial loads while minimizing trips to the fuel pump.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | GL |
| Generation | GL (X166) |
| Type (Engine) | GL 350 BlueTEC (258 Hp) 4MATIC G-TRONIC |
| Start of production | 2012 |
| End of production | 2015 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 7 |
| Doors | 5 |
| Fuel consumption (urban) | 8.1-8.7 l/100 km (29-27 US mpg) |
| Fuel consumption (extra urban) | 6.9-7.3 l/100 km (34.1-32.2 US mpg) |
| Fuel consumption (combined) | 7.4-7.8 l/100 km (31.8-30.2 US mpg) |
| CO2 emissions | 192-205 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 | 220 km/h (136.7 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 9.2 kg/Hp, 108.4 Hp/tonne |
| Weight-to-torque ratio | 3.8 kg/Nm, 260.5 Nm/tonne |
| Power | 258 Hp @ 3600 rpm |
| Torque | 620 Nm @ 1600-2400 rpm (457.29 lb.-ft. @ 1600-2400 rpm) |
| Maximum engine speed | 4200 rpm |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 642.826 |
| 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) |
| Kerb Weight | 2380 kg (5247 lbs.) |
| Max. weight | 3250 kg (7165.02 lbs.) |
| Max load | 870 kg (1918.02 lbs.) |
| Trunk (boot) space – minimum | 680 l (24.01 cu. ft.) |
| Trunk (boot) space – maximum | 2300 l (81.22 cu. ft.) |
| Fuel tank capacity | 100 l (26.42 US gal | 22 UK gal) |
| Permitted trailer load with brakes (12%) | 3500 kg (7716.18 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Length | 5120 mm (201.57 in.) |
| Width | 1934 mm (76.14 in.) |
| Width including mirrors | 2141 mm (84.29 in.) |
| Height | 1850 mm (72.83 in.) |
| Wheelbase | 3075 mm (121.06 in.) |
| Front track | 1655 mm (65.16 in.) |
| Rear (Back) track | 1675 mm (65.94 in.) |
| Front overhang | 885 mm (34.84 in.) |
| Rear overhang | 1160 mm (45.67 in.) |
| Minimum turning circle (turning diameter) | 12.4 m (40.68 ft.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 7 gears, automatic transmission G-TRONIC PLUS |
| Front suspension | Double wishbone |
| 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 | 265/60 R18 |
| Wheel rims size | 18 |
Powertrain & Engine Architecture
The GL 350 BlueTEC was powered by the OM 642.826 3.0-liter V6 diesel engine. This engine, a mainstay in the Mercedes-Benz lineup, featured a robust cast iron block and aluminum cylinder heads. It employed a sophisticated common-rail direct injection system, delivering fuel at extremely high pressures (up to 2,000 bar) for optimized combustion. A variable geometry turbocharger with an intercooler further enhanced performance and efficiency. The engine also incorporated a diesel particulate filter (DPF) and a selective catalytic reduction (SCR) system utilizing AdBlue (Diesel Exhaust Fluid) to significantly reduce NOx emissions, meeting stringent Euro 6 standards. The engine’s DOHC valvetrain, with four valves per cylinder, contributed to its broad torque curve. Power was transmitted to all four wheels via Mercedes-Benz’s 7G-TRONIC PLUS seven-speed automatic transmission, known for its smooth shifts and responsive operation. This transmission was specifically tuned to complement the diesel engine’s characteristics, prioritizing fuel efficiency and effortless cruising.
Driving Characteristics
The GL 350 BlueTEC offered a distinctly different driving experience compared to the gasoline-powered GL models. While not as overtly quick as the GL 550, the 350 BlueTEC delivered ample torque – 457 lb-ft – from as low as 1600 rpm. This resulted in strong acceleration in everyday driving situations and effortless towing capability. The 7G-TRONIC transmission was well-matched to the engine, providing smooth and timely gear changes. The automatic transmission’s gear ratios were optimized for both fuel economy and responsiveness. Compared to a manual transmission, the automatic prioritized comfort and ease of use, making it ideal for long-distance journeys. The GL’s substantial weight (over 5,200 lbs) was noticeable, but the engine’s torque helped to mitigate this, providing confident passing power. The 4MATIC all-wheel-drive system ensured excellent traction in various weather conditions.
Equipment & Trim Levels
The GL 350 BlueTEC came standard with a generous array of features, including leather upholstery, power-adjustable front seats with memory function, a premium audio system, dual-zone automatic climate control, and a rearview camera. Standard safety features included ABS, stability control, traction control, and multiple airbags. Optional extras included a panoramic sunroof, rear-seat entertainment system, heated and ventilated front seats, a navigation system, and advanced driver-assistance features such as lane-keeping assist and blind-spot monitoring. Interior trim options included various wood veneers and aluminum accents. The overall interior ambiance was one of understated luxury and refinement.
Chassis & Braking
The GL 350 BlueTEC featured a fully independent suspension system, with double wishbones at the front and a multi-link setup at the rear. This configuration provided a comfortable ride quality, even on rough roads. The suspension was tuned to balance ride comfort with handling stability. Ventilated disc brakes were fitted on all four wheels, providing ample stopping power. The GL 350 BlueTEC’s braking system was further enhanced by ABS, electronic brake-force distribution, and brake assist. The vehicle’s substantial weight necessitated a robust braking system to ensure safe and controlled stopping distances.
Market Reception & Comparison
The GL 350 BlueTEC was generally well-received by automotive critics. It was praised for its fuel efficiency, powerful engine, comfortable ride, and spacious interior. Compared to the GL 450, the 350 BlueTEC offered superior fuel economy and comparable performance, making it a more practical choice for many buyers. The GL 550, with its larger gasoline engine, provided more outright power but at the expense of fuel efficiency. Reliability reports indicated that the OM 642 engine was generally durable, although the diesel particulate filter and SCR system could require maintenance over time.
Legacy
The Mercedes-Benz GL 350 BlueTEC (X166) remains a popular choice in the used SUV market. Its combination of luxury, capability, and fuel efficiency continues to appeal to buyers seeking a versatile and refined vehicle. The OM 642 engine, while requiring periodic maintenance of its emissions control systems, is known for its longevity. The 7G-TRONIC transmission has also proven to be reliable. As a result, well-maintained examples of the GL 350 BlueTEC can provide many years of dependable service. The X166 generation GL-Class, and particularly the 350 BlueTEC variant, helped solidify Mercedes-Benz’s position as a leader in the luxury SUV segment.
