Mercedes-Benz GLS X166 GLS 400 (333 Hp) 4MATIC G-TRONIC


Overall Rating

8.6 / 10
Safety N/A / 5
Not Rated
Engine 4.8 / 5
Value 3.8 / 5
Performance 4.5 / 5
Comfort 4.8 / 5
People\'s Opinion N/A / 5
Not Rated

Mercedes-Benz GLS:

The Mercedes-Benz GLS, formerly Mercedes-Benz GL-Class, is a full-size luxury crossover SUV produced by Mercedes-Benz since 2006. In each of its generations it is a three-row, seven-passenger vehicle positioned above the GLE. The GLS is considered the flagship of the marque's SUV lineup, although the body-on-frame G-Class is more expensive and has been in production longer....(Read more on Wikipedia)

X166 Overview:

Mercedes-Benz GLS (X166). With 480 Nm of torque, it offers ample pulling power. It has moderate fuel consumption (~11.4 l/100km). At around 2360 kg, it’s on the heavier side. All‑wheel drive provides excellent grip, ideal for off‑road use. Acceleration is good (0–100 km/h in 6.6 s). The top speed reaches 240 km/h. A sport utility vehicle offering higher ground clearance and versatile cargo space. Seating for 5 makes it ideal for daily use.

Safety Rating
Not rated
Euro NCAP Year N/A
Adult Occupant N/A
Stars N/A
Expert Note:
The Mercedes-Benz GLS (X166) was not directly tested by Euro NCAP. However, its platform sibling, the GLE (W166), achieved a 5-star rating in 2015, suggesting a high level of inherent safety.

GLS 400 (333 Hp) 4MATIC G-TRONIC Verdict:

Rating 4 stars

Performance Verdict

A well-balanced petrol engine, offering strong and smooth performance that feels capable and refined.

Fuel Economy

Better fuel economy than the V8 petrol options, making it a more sensible choice for mixed driving.

Best Use Case: Mixed driving conditions, those preferring a petrol engine over diesel, luxury family transport.

Pros and Cons:

Pros:

  • • Exceptional interior luxury and build quality
  • • Spacious cabin with true seven-seat capability
  • • Smooth and comfortable ride, especially with air suspension
  • • Powerful and refined engine options across the range
  • • Strong towing capacity and off-road capability (with optional packages)

Cons:

  • • High purchase price and running costs, particularly for V8 models
  • • Large dimensions can make city driving and parking challenging
  • • Fuel economy is a significant concern for petrol variants
  • • Complex technology can lead to higher maintenance costs over time

Specifications:

General:
Brand:Mercedes-Benz
Model:GLS
Generation:X166
Modification (Engine):GLS 400 (333 Hp) 4MATIC G-TRONIC
Start of production:2015
End of production:2019
Powertrain Architecture:Internal Combustion engine
Body type:SUV
Seats:5
Doors:5
Engine:
Power:333 Hp @ 5250-6000 rpm.
Power per litre:111.1 Hp/l
Torque:480 Nm @ 1600-4000 rpm.
Engine Model/Code:M 276.821
Engine displacement:2996
Number of cylinders:6
Engine configuration:V-engine
Fuel injection system:Direct injection
Engine aspiration:BiTurbo, Intercooler
Engine oil capacity:7 l
Coolant:10.5 l
Engine layout:Front, Longitudinal
Compression ratio:10.5:1
Performance:
Fuel Type:Petrol (Gasoline)
Fuel consumption (economy) - urban:11.7-11.1 l/100 km
Fuel consumption (economy) - extra urban:8.0-7.5 l/100 km
Fuel consumption (economy) - combined:9.4-8.9 l/100 km
Emission standard:Euro 6
Acceleration 0 - 100 km/h:6.6 sec
Acceleration 0 - 62 mph:6.6 sec
Maximum speed:240 km/h
Weight-to-power ratio:7.1 kg/Hp, 141.1 Hp/tonne
Weight-to-torque ratio:4.9 kg/Nm, 203.4 Nm/tonne
Acceleration 0 - 60 mph:6.3 sec
Space:
Kerb Weight:2360
Max. weight:3250
Max. roof load:100 kg
Max load:890
Trunk (boot) space - maximum:2300 l
Trunk (boot) space - minimum:680 l
Permitted trailer load with brakes (12%):3500 kg
Fuel tank capacity:100 l
Permitted trailer load without brakes:750 kg
Size:
Length:5130 mm mm
Width:1934 mm mm
Height:1850 mm mm
Wheelbase:3075 mm mm
Width including mirrors:2141 mm
Front track:1655 mm
Rear (Back) track:1675 mm
Minimum turning circle (turning diameter):12.40 m
Powertrain:
Drive wheelAll wheel drive (4x4)
Number of gears9
Transmission typeAutomatic
Gearbox typeG-TRONIC
Front brakesVentilated discs
Rear brakesVentilated discs
Assisting systemsABS (Anti-lock braking system)
Steering typeSteering rack and pinion
Tires size265/60 R18
Wheel rims size18
Front suspensionDouble wishbone
Rear suspensionIndependent multi-link suspension

Is the Mercedes-Benz GLS the king of its class? Share your thoughts.