The Mercedes-Benz GL 450 V8 4MATIC, produced between 2012 and 2016 as part of the X166 GL-Class generation, represented a significant offering in the full-size luxury SUV segment. Positioned as a mid-to-upper trim level within the GL range, it bridged the gap between the entry-level GL 350 and the high-performance GL 63 AMG. This variant combined a powerful, naturally aspirated V8 engine with a sophisticated all-wheel-drive system and a smooth-shifting seven-speed automatic transmission, aiming to deliver a blend of luxury, capability, and performance for American buyers seeking a spacious and refined SUV.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | GL |
| Generation | GL (X166) |
| Type | GL 450 V8 (362 Hp) 4MATIC 7G-TRONIC PLUS |
| Start of production | 2012 |
| End of production | 2016 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 7 |
| Doors | 5 |
| Fuel consumption (urban) | 16.8 l/100 km (14 US mpg, 16.8 UK mpg) |
| Fuel consumption (extra urban) | 12.4 l/100 km (19 US mpg, 22.8 UK mpg) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 60 mph | 6.2 sec |
| Emission standard | ULEV |
| Weight-to-power ratio | 6.8 kg/Hp, 147.8 Hp/tonne |
| Weight-to-torque ratio | 4.5 kg/Nm, 224.5 Nm/tonne |
| Power | 362 Hp @ 5000-6000 rpm |
| Power per litre | 77.6 Hp/l |
| Torque | 550 Nm @ 1500-4000 rpm (405.66 lb.-ft. @ 1500-4000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M 278.928 |
| Engine displacement | 4663 cm3 (284.55 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 92.9 mm (3.66 in.) |
| Piston Stroke | 86 mm (3.39 in.) |
| Compression ratio | 10.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | BiTurbo, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 8.5 l (8.98 US qt | 7.48 UK qt) |
| Coolant capacity | 11 l (11.62 US qt | 9.68 UK qt) |
| Kerb Weight | 2450 kg (5401.33 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) |
| Max. roof load | 100 kg (220.46 lbs.) |
| Permitted trailer load with brakes (12%) | 3402 kg (7500.13 lbs.) |
| Permitted towbar download | 272 kg (599.66 lbs.) |
| Length | 5120 mm (201.57 in.) |
| Width | 1934 mm (76.14 in.) |
| Width including mirrors | 2141 mm (84.29 in.) |
| Height | 1850-1940 mm (72.83 – 76.38 in.) |
| Wheelbase | 3075 mm (121.06 in.) |
| Front track | 1646 mm (64.8 in.) |
| Rear track | 1664 mm (65.51 in.) |
| Front overhang | 885 mm (34.84 in.) |
| Rear overhang | 1160 mm (45.67 in.) |
| Ride height (ground clearance) | 201-306 mm (7.91 – 12.05 in.) |
| Drag coefficient (Cd) | 0.376 |
| Minimum turning circle | 12.4 m (40.68 ft.) |
| Approach angle | 25-33° |
| Departure angle | 20-27° |
| Climb angle | 45° |
| Wading depth | 600 mm (23.62 in.) |
| Drivetrain Architecture | All wheel drive (4×4). Internal Combustion engine. |
| Number of gears | 7 |
| Gearbox type | automatic transmission G-TRONIC PLUS |
INTRODUCTION
The Mercedes-Benz GL 450 V8 4MATIC, launched in 2012, was a key component of the second-generation GL-Class (X166). This generation marked a significant step forward in terms of luxury, technology, and overall refinement compared to its predecessor. The GL 450 V8 occupied a sweet spot in the lineup, offering a substantial power upgrade over the base GL 350 while remaining more accessible than the performance-oriented GL 63 AMG. It was primarily aimed at American families and individuals who desired a large, comfortable, and capable SUV with a prestigious badge. Production continued through the 2016 model year, after which the GL-Class was rebranded as the GLS-Class.
Powertrain & Engine Architecture
At the heart of the GL 450 V8 lay the M278.928 4.7-liter V8 engine. This engine was a cornerstone of Mercedes-Benz’s powertrain strategy during this period, featuring direct fuel injection, twin turbochargers, and a sophisticated valvetrain with four valves per cylinder. The engine produced 362 horsepower at 5000-6000 rpm and a robust 550 Nm (405.66 lb-ft) of torque available from a low 1500 rpm, providing ample power for both everyday driving and towing. The engine’s architecture was longitudinal, meaning it was mounted lengthwise in the chassis.
The engine was paired with Mercedes-Benz’s 7G-TRONIC PLUS seven-speed automatic transmission. This transmission was known for its smooth and responsive shifts, contributing to a refined driving experience. The 7G-TRONIC PLUS featured a torque converter lock-up clutch to improve fuel efficiency at cruising speeds. The 4MATIC all-wheel-drive system distributed power between the front and rear axles, enhancing traction and stability in various driving conditions. The system was primarily rear-biased, providing a more engaging driving feel.
Driving Characteristics
The GL 450 V8 offered a compelling blend of power and comfort. The V8 engine delivered strong acceleration, with a 0-60 mph time of around 6.2 seconds. The readily available torque made overtaking effortless, even when fully loaded. While not as overtly sporty as some competitors, the GL 450 V8 felt confident and composed on the road. The 7G-TRONIC PLUS transmission contributed to a smooth and seamless driving experience, with well-chosen gear ratios that maximized both performance and fuel efficiency. Compared to the GL 350, the V8 offered a noticeable increase in power and responsiveness. However, it lacked the aggressive character and sharper handling of the GL 63 AMG.
Equipment & Trim Levels
The GL 450 V8 came standard with a generous array of features, reflecting its position as a mid-to-upper trim level. Standard equipment typically included leather upholstery, power-adjustable front seats with memory function, a premium sound system, a rearview camera, and a power liftgate. Optional extras included a panoramic sunroof, heated and ventilated front seats, rear-seat entertainment system, and a driver assistance package with features like blind-spot monitoring and lane-keeping assist. Interior trim options ranged from wood veneers to aluminum accents, allowing buyers to personalize the cabin to their preferences.
Chassis & Braking
The GL 450 V8 featured a robust chassis designed to handle its substantial weight and provide a comfortable ride. The front suspension utilized a double wishbone design with a transverse stabilizer bar, while the rear suspension employed an independent multi-link setup, also with a stabilizer bar. Air suspension was standard, allowing the ride height to be adjusted for improved comfort or off-road capability. The braking system consisted of ventilated discs on all four wheels, providing ample stopping power. Anti-lock brakes (ABS) and electronic stability control (ESC) were standard safety features.
Market Reception & Comparison
The GL 450 V8 was generally well-received by automotive critics. It was praised for its powerful engine, comfortable ride, spacious interior, and luxurious features. However, some reviewers noted that its fuel economy was relatively low, and its handling was not as sharp as some competitors. Compared to the GL 350, the V8 offered a significant performance upgrade, but at a higher price point. The GL 63 AMG provided even more performance, but came with a considerably higher price tag and a firmer ride. The GL 450 V8 struck a balance between performance, luxury, and value, making it a popular choice among buyers in its segment.
Legacy
The Mercedes-Benz GL 450 V8 4MATIC has proven to be a relatively reliable SUV in the used car market. The M278 engine, while complex, is generally considered durable when properly maintained. Regular oil changes and adherence to the manufacturer’s recommended service intervals are crucial for long-term reliability. Common issues reported by owners include occasional problems with the air suspension system and the electronic components. However, these issues are typically not major and can be addressed with proper repairs. Today, the GL 450 V8 remains a desirable option for buyers seeking a spacious, luxurious, and capable SUV with a powerful V8 engine.
