Mercedes GLS review - Engines, performance and drive
The single engine option is strong and refined, while comfort is exceptional – with the right options selected
On the road, the GLS gets very close to Mercedes’s claims of an ‘S-Class of SUVs’. Refinement is excellent and performance is more than adequate, so overall it’s a very relaxing, comfortable place to while away the miles.
As standard the GLS comes with air suspension, but its real party trick comes with the Advanced E-Active Body Control suspension set-up. This employs two cameras that scan the road ahead to prime the suspension in order to cancel out any ruts and bumps.
Without this system, the GLS can occasionally thump into large bumps, the body rocking across cambers and undulations; it falls short of the X7 in terms of both comfort and control. With it, however, the ride quality and body control are just sublime.
E-Active Body Control can make a difference in the corners, too. In its normal setting, it helps to fight against body roll, leaving a stable platform at all times. However, switch to ‘Curve’ mode and it can actively lean into the corners. It’s at its best on motorways and fast, flowing A-roads, where it gives the feeling of a high speed train. However, on very twisty sections the system struggles to keep up. Regardless, the GLS feels is stable, predictable, and offers up strong levels of grip. The steering is light and precise.
It’s quiet on the move, too. The most audible noise at speed comes from the tyres, but this isn’t a criticism: it’s just that everything else is so quiet. A fairly slippery shape (at least by SUV standards) means that wind noise is well suppressed, while the engine only really makes itself heard when you ask for hard acceleration.
One area where the GLS falls short of the X7, however, is manoeuvrability. The BMW is available with four wheel steering, which makes town driving remarkably easy for a car of this size. Without it, the GLS feels rather cumbersome by comparison.
Engines, 0-60 acceleration and top speed
From launch, the GLS UK range has only one engine option: the 400 d, powered by a 325bhp 3.0-litre V6 diesel. It copes easily with the near-2.5 tonne mass it needs to haul about thanks to a hefty 700Nm of torque delivered from as little as 1,200rpm. It allows the GLS to cover the 0-62mph sprint in 6.3 seconds and achieve a top speed of 148mph.
It’s also remarkably quiet on the move and, although not quite as hushed as in an S-Class saloon, emits only a distant rumble under hard acceleration. It’s mated to Mercedes’ nine-speed automatic transmission, which for the most part goes about its business unnoticed.
In this review
- 1Mercedes GLS reviewVast SUV delivers unbeatable practicality and wonderful refinement, but lacks the S-Class’s sense of occasion
- 2Engines, performance and drive - currently readingThe single engine option is strong and refined, while comfort is exceptional – with the right options selected
- 3MPG, CO2 and Running CostsThis is a big, heavy car; even with a capable diesel engine it will cost a pretty penny at the pumps
- 4Interior, design and technologyCabin is well finished and packed with brilliant tech, but it doesn’t quite feel special enough for the price
- 5Practicality, comfort and boot spaceThe GLS is the most spacious posh seven-seater on the market – but its vast size will cause headaches on the road
- 6Reliability and SafetyA brilliant safety rating is all but guaranteed, but Mercedes ownership prospects are below average