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Mercedes-BenzGLS (2019-)

Medium/Large SUV
Petrol/Diesel/Mild hybrid
Available new

£103,300Typical price

Test score

where to buy or sell

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Made in the USA, the Mercedes GLS has all the trappings of American SUVs, including enormous heft, large wheels, a big engine and ample interior space. Does this luxury 4x4 make sense on UK roads? Read our full review to find out.

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What's included?

What is it?
What’s it great at?
What’s it like to drive?
How reliable are Mercedes-Benz's cars?
How comfortable and spacious is it?
How economical is it to run?
How safe is it?
Is there anything I should know?
Should I buy it?

KEY TEST RESULTS
Comfort and practicality
Brand reliability 0-4 years

Jan 2025First reviewed by Which?
Jan 2019Released

The overall Which? test score is made up of the following star ratings, all determined by our rigorous lab tests.

How we test cars

20 May 2025

Ease of driving

Overall
Visibility
Smoothness of power delivery
Driving stability
Cabin layout

How we test ease of driving

To find out how easy a car is to drive, we assess cars across a number of areas from visibility and handling to the layout of the cabin and how smoothly the engine delivers its power.

Performance

Overall
In-gear acceleration
Brakes

How we test performance

We test braking distances and whether the effectivess of the brakes fade with repeat use. Performanc is based on in-gear acceleration.

Comfort and practicality

Overall
Entry and exit
Seat comfort
Ride quality
Quietness
Seat space
Boot space (large cars, SUVs and MPVs)

How we test comfort and practicality

Comfort and practicality includes how easy it is, or not, to get in and out of the car and the maximum height of occupants. We also measure road, wind and engine noise and assess how well the car deals with bumps from large potholes to jittery surfaces like cobble stones.

Safety kit

How we test safety kit

We factor in the safety equipment that’s factory-fitted or optional, along with how well the car protects its occupants and pedestrians in the event of an accident. We also test how easy it is to fit a variety of child car seats.

Brand reliability 0-4 years

Overall
Electric car reliability
Plug-in hybrid reliability
Petrol reliability
Diesel reliability

How we test brand reliability 0-4 years

Our reliability ratings are based on the feedback from tens of thousands of UK motorists, as collected in our annual Which? car survey. We divide all reliability feedback into three age groups: cars aged up to four years, five to nine years, and 10 to 15 years.

Brand reliability 5-9 years

Overall
Diesel reliability

Brand reliability 10-15 years

Overall
Petrol reliability
Diesel reliability

General
Class	Medium/Large SUV
Luxury	Yes
Convertible	No
Availability	Available new
New price	£103,300 - £116,680
Fuel type	Petrol/Diesel/Mild hybrid
Tested fuel efficiency	32.1mpg
Length	5,209mm
Width (excluding wing mirrors)	1,956mm
Width (including wing mirrors)	2,160mm
Height	1,823mm
Driver max height
Second-row passenger max height
Third row passenger max height
Boot space with seats up
Boot space with seats down
Number of seats	7
Folding rear seats	Yes
Isofix attachments	Yes
Turning circle	12.7 m
On sale date	06 May 2019
Lowest pence-per-mile cost	£19.90

Latest tested engine
Engine and trim name	450d 4MATIC AMG Line Premium Plus
Fuel type	Mild-Diesel-Hybrid
Capacity and power	3-litre (387hp)
Transmission	9-speed automatic
Driven wheels	Four-wheel-drive (4WD)
Fuel tank capacity	90 litres
Tested fuel economy: City / Out of town / Motorway (mpg)
Tested fuel economy: Combined (mpg)
Cost per mile	19.9p per mile
Cost of filling tank	£126
Monthly fuel cost
Annual fuel cost
NOx level	Extremely Low (trace)
CO level	Low
CO2 at tailpipe/tank-to-wheel (TTW) (g/km)	233
Official fuel economy: WLTP	31.7 to 32.5
Braked tow load (KG)	3500kg
Unbraked tow load (KG)	750kg
Engine test date	23 September 2024
Test programme	2017

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Mercedes-BenzGLS (2019-)

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pros

cons

What's included?

How we test cars

Ease of driving

Performance

Comfort and practicality

Safety kit

Brand reliability 0-4 years

Brand reliability 5-9 years

Brand reliability 10-15 years

How this product's score compares with other new and used cars we've tested

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