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View all Mercedes-Benz GLS reviews
Parkers overall rating: 4.2 out of 5 4.2

How big is the Mercedes-Benz GLS?

  • Vast exterior dimensions mean big interior
  • Three rows of seats, plus a big boot
  • All seats move electrically

The third-generation GLS has a 3135mm wheelbase, which is 60mm longer than its predecessor. This increase in length has created more interior space, particularly for second-row occupants, bolstering both comfort and accessibility.

Up front there are no complaints, with a vast amount of space to stretch out in. It’s a similar story in the middle row, with electrically adjustable seats across the bench. Slide these forwards slightly to free up some extra room in the third row and it’s possible to get a pair of adults in the back. This is helped by the tall body and high roofline that stretches the length of the car.

Mercedes-Benz GLS SUV rear three-quarter

There’s no escaping just how big the GLS is though. It’ll easily fill (and probably hang out of) any UK parking space, and can feel wide on small roads, but the good news is that there are sensors and cameras all around the car to boost manoeuvrability. Just be aware that it’s bigger than your typical Volvo XC90 or Land Rover Discovery.

How big is the boot?

If you need lots of storage, you’re also in luck; the rearmost seats fold flat into the floor, and the seats in the second row fold flat, unlocking a whopping 2,400 litres of storage space – 100 litres more than the second-generation GLS. You won’t have to faff to get the seats down, either, as all are electrically adjustable and fold away at the press of a button from the boot of the car. You can also lower the air suspension to make it a little more accessible.

Mercedes-Benz GLS SUV boot space

With the third row in place, boot space measures at 355 litres; but folded, a vast 890 litres of space is available, while in full van spec there’s 2,400 litres to play with. There’s a generous amount of extra storage space throughout the car too, with big door bins, a large central storage bin beneath the armrest and no less than three USB ports to keep your devices charged.

How safe is the Mercedes-Benz GLS?

  • Strong safety credentials in the GLS
  • Four Isofix child seat anchors
  • Plus standard-fit driver assistance pack

The 2019 GLS comes with an array of safety equipment, as you’d expect, even in the base AMG Line Premium specification. Standard features include a Driving Assistance package, parking assistance with a 360-degree camera, a head-up display and Trailer Manoeuvring Assist.

The Driving Assistance package comes with:

  • Active Blind Spot Assist
  • Exit warning function
  • Active Braking Assist
  • Cornering and Cross-Traffic function
  • Congestion emergency braking function
  • Active Distance Assist DISTRONIC
  • Active Speed Limit Assist
  • Extended restart function on motorways
  • Route-Based Speed Adjustment with end of tailback function
  • Active Lane Keeping Assist
  • Active Steering Assist
  • Active Lane Changing Assist
  • Active Emergency Stop Assist with SOS function
  • Emergency lane function
  • Evasive Steering Assist
  • Pedestrian warning function near pedestrian crossings
  • PRE-SAFE PLUS
  • Traffic Sign Assist

On AMG Line Premium Plus and Premium Plus Executive cars, the Driving Assistance Plus package is standard, and adds:

  • Active Stop-and-Go Assist
  • PRE-SAFE impulse side - moves occupants away from doors just before an imminent side impact

This equipment should give the GLS a five-star Euro NCAP crash safety rating, especially as the smaller GLE received the full five stars.

Mercedes-Benz GLS equipment

  • All AMG Line-based trim levels
  • All are well-equipped
  • Move up the list and you get more luxury kit

All GLS models in the UK are AMG Line, but with a choice of AMG Line Premium, AMG Line Premium Plus and AMG Line Premium Plus Executive.

As you’d expect, the model with the most words comes with the most kit, building on the former with more technology and more luxury.

Various options packs are available on top of this as opposed to individual options, with things like a Rear Seat Entertainment Pack making it more of a luxury limo, while the Off-Road Engineering package makes the GLS a match for offerings from Land Rover.

Basic equipment

The basic equipment list includes equipment that is standard across all versions of the Mercedes-Benz GLS SUV.

  • ABS
  • Alarm
  • Alloy wheels
  • Audio remote
  • Driver`s airbag
  • Electric mirrors
  • Electric sunroof
  • Heated mirrors
  • Heated seats
  • Isofix child seat anchor points
  • Leather seat trim
  • Metallic Paint
  • Parking sensors
  • PAS
  • Passenger`s airbag
  • Remote locking
  • Roof rails
  • Service indicator
  • Side airbags
  • Steering wheel rake adjustment
  • Steering wheel reach adjustment
  • Traction control

Equipment by trim level

To view equipment options for a specific trim level, please select from the following list:

Equipment included on some trim levels
  • Sat Nav

AMG Line equipment

AMG Line standard equipment
Same as basic equipment
AMG Line optional equipment
  • Sat Nav