2009-2012 Mercedes-Benz GL (X164 facelift ) GL 450 (340 Hp) 4MATIC G-TRONIC

The Mercedes-Benz GL 450 4MATIC, part of the X164 facelift generation produced from 2009 to 2012, represented a significant offering in the 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 550. This variant aimed to provide a balance of power, luxury, and capability, appealing to buyers seeking a spacious, seven-passenger SUV with robust all-wheel-drive capabilities. The X164 GL was Mercedes-Benz’s first foray into the full-size luxury SUV market, directly competing with vehicles like the BMW X5, Audi Q7, and Cadillac Escalade.

Technical Specifications

INTRODUCTION

The Mercedes-Benz GL 450 4MATIC (X164 facelift) was produced from 2009 through 2012. It occupied a crucial position in the GL lineup, offering a compelling blend of performance and luxury. Built on the X164 platform, which also underpinned the ML-Class and R-Class, the GL aimed to provide a more spacious and versatile alternative to traditional luxury SUVs. The facelift introduced in 2009 brought revised styling, updated technology, and improved efficiency compared to the original X164 models. The 4MATIC all-wheel-drive system was standard, enhancing its capability in various weather conditions.

Powertrain & Engine Architecture

At the heart of the GL 450 was the M273.923 4.7-liter naturally aspirated V8 engine. This engine, a staple of Mercedes-Benz’s lineup during this period, featured a three-valve-per-cylinder design (two intake, one exhaust) and a cast iron block with aluminum cylinder heads. It utilized multi-port fuel injection and a double overhead camshaft (DOHC) valvetrain. The engine produced 340 horsepower at 6,000 rpm and 460 Nm (339.28 lb-ft) of torque between 2,700 and 5,000 rpm. The engine’s longitudinal mounting allowed for a rear-wheel-drive bias, with the 4MATIC system engaging all four wheels as needed. Paired with the engine was the 7G-TRONIC seven-speed automatic transmission, known for its smooth shifts and efficiency. This transmission featured a torque converter lock-up clutch to improve fuel economy at cruising speeds.

Driving Characteristics

The GL 450 4MATIC offered a comfortable and refined driving experience. While not as overtly sporty as some of its competitors, the V8 engine provided ample power for everyday driving and confident highway passing. The 7G-TRONIC transmission contributed to smooth acceleration, although it could sometimes feel slightly hesitant in kickdown situations. The 4MATIC system provided excellent traction in various conditions, making it a capable all-weather vehicle. The GL 450’s substantial weight (2355 kg / 5191.89 lbs) was noticeable, particularly during spirited driving. Compared to the GL 350, the 450 offered a significant performance advantage, while the GL 550 provided even more power but at the cost of increased fuel consumption. The gear ratios were tuned for a balance of acceleration and fuel efficiency, with a relatively tall final drive ratio.

Equipment & Trim Levels

The GL 450 4MATIC came standard with a generous array of features, including leather upholstery, power-adjustable front seats with memory function, dual-zone automatic climate control, a premium sound system, and a power liftgate. Standard safety features included ABS, traction control, stability control, and multiple airbags. Optional extras included a rear-seat entertainment system, a panoramic sunroof, adaptive cruise control, and parking assist. Interior trim options included wood veneers and aluminum accents. The dashboard layout was typical of Mercedes-Benz at the time, with a focus on elegance and functionality.

Chassis & Braking

The GL 450 featured a robust chassis designed to handle its weight and provide a comfortable ride. The front suspension utilized a double wishbone design, while the rear suspension employed an independent multi-link setup. This configuration helped to minimize body roll and provide a stable platform. Ventilated disc brakes were used on all four wheels, providing ample stopping power. The GL 450’s braking system was enhanced by ABS and electronic brake-force distribution. Stabilizer bars were fitted to both the front and rear axles to further reduce body roll during cornering.

Market Reception & Comparison

The GL 450 4MATIC was generally well-received by automotive critics. It was praised for its spacious interior, comfortable ride, and capable all-wheel-drive system. However, some reviewers noted its relatively high fuel consumption and substantial weight. Compared to the GL 350, the 450 offered a noticeable performance improvement, justifying its higher price tag for buyers prioritizing power. Against competitors like the BMW X5 and Audi Q7, the GL 450 offered a more luxurious and spacious interior, but its handling was not as sharp. Fuel economy figures of 13.4 l/100 km (17.6 US mpg) were typical for a V8-powered SUV of this size and class.

Legacy

The Mercedes-Benz GL 450 4MATIC (X164 facelift) remains a popular choice in the used SUV market. The M273 V8 engine, while known for its complexity, is generally considered reliable when properly maintained. Common maintenance items include regular oil changes, coolant flushes, and spark plug replacements. The 7G-TRONIC transmission is also relatively reliable, but may require occasional servicing. The GL 450’s spacious interior and comfortable ride continue to appeal to buyers seeking a luxurious and capable family SUV. While newer SUVs offer improved fuel efficiency and technology, the X164 GL 450 represents a well-built and refined vehicle that still holds its own today.