Skip advert
Advertisement

New Mercedes CLS 2018 review

The new Mercedes CLS combines a sleek design with the practicality of a four-door saloon, but what’s it like on the road?

Find your Mercedes CLS
Compare deals from trusted partners on this car and previous models.
Or are you looking to sell your car?
Value my car
Fast, no-nonsense car selling
Value my car

The new Mercedes CLS works wonderfully with such a strong and capable diesel engine. Thanks to the relaxed way in which it delivers its prodigious power, the 400 d really suits the smooth-riding grand tourer nature of this car – especially with the added security of the standard 4MATIC all-wheel-drive system. Despite all that performance, it promises to return just over 50mpg, too.

Advertisement - Article continues below

Not many cars can claim to have spawned a whole new class of vehicle, but it’s fair to say that without the Mercedes CLS, there would be no such thing as the Audi A7, BMW 4 Series Gran Coupe or Volkswagen Arteon.

This brand-new model is the third-generation CLS and, like the previous two, it sets out to combine the elegance and style of a coupe with the space and practicality of a four-door saloon. As we discovered when we drove the range-topping Mercedes-AMG CLS 53, it provides an attractive halfway house between performance and practicality.

New Mercedes-AMG CLS 53 review

However, there’s no doubt that more customers in the UK will go for one of the standard petrol or diesel models, so here we’re looking at the CLS 400 d. And while the AMG 53 doesn’t arrive until later in the year, less expensive versions such as this (as well as the 350 d and 450 petrol) are already on sale here.

The 400 d isn’t just the most powerful diesel-engined CLS, it’s also the most potent diesel Mercedes has ever put into a production car. The vital statistics alone make pretty impressive reading: 335bhp and 700Nm, fed through a nine-speed auto and standard all-wheel drive. With a 0-62mph acceleration time of just 5.0 seconds, the diesel is only half a second slower than the AMG.

Advertisement - Article continues below
Skip advert
Advertisement
Skip advert
Advertisement - Article continues below

Used - available now

Convertible

2021 MINI

Convertible

48,457 milesManualPetrol1.5L

Cash £10,700
View Convertible
Qashqai

2022 Nissan

Qashqai

18,385 milesManualPetrol1.3L

Cash £15,219
View Qashqai
Kuga

2023 Ford

Kuga

19,731 milesAutomaticPetrol2.5L

Cash £20,405
View Kuga
2008

2017 Peugeot

2008

49,477 milesManualPetrol1.2L

Cash £7,907
View 2008

But for all that promise of great performance, what you notice first of all is just how relaxing this thing is to drive. That’s because all of the car’s torque is available from as little as 1,200rpm, so when you put your foot down, things happen pretty much immediately. With response as swift and as strong as that, you never have to work the engine hard to get the CLS going remarkably quickly.  

That automatic gearbox is smooth, too, kicking down (on the rare occasions it needs to) quickly and efficiently. The car feels tremendously sure-footed in even the worst weather conditions as well. Throw in an extremely comfortable ride and excellent refinement and, overall, the CLS 400 d comes across as a tremendous grand tourer.

But this isn’t a vehicle to grab by the scruff of the neck and drive flat out. Instead, it’s about settling back and taking things a bit easier. It’s a luxury car that can transport you from A to B in the blink of an eye. And that feeling of being whisked in total comfort is supported by the exquisite cabin, which shares much with the E and S-Class saloons.

All cars include 12.3-inch digital dials and widescreen cockpit displays, as well as ambient lighting that can switch between 64 colours. There’s leather everywhere you look, while the quality of craftsmanship is second to none.

Every model gets 19-inch wheels, a parking package (including an HD reversing camera), Agility Control suspension and intelligent lighting. The £3,895 Premium Plus pack includes keyless go, electric seats, a Burmester stereo and an electric sunroof.

If you do plan on carrying passengers, all but the tallest adults will be perfectly happy in the back, providing you put them in either of the outer two seats. That said, as you would only expect, there is a price to pay for the sleek and elegant lines, and the CLS isn’t quite as spacious or as practical as an E-Class.

Skip advert
Advertisement
Chief sub-editor

Andy ensures that every word that is written in the magazine is up to the right standards week in week out. He has been writing, talking and presenting videos about cars for more than 30 years, and on the staff at Auto Express since March 2019.

New & used car deals

Skoda Kodiaq

Skoda Kodiaq

RRP £39,045Avg. savings £4,356 off RRP*Used from £10,850
Toyota Yaris Cross
Audi A3

Audi A3

RRP £26,310Avg. savings £2,657 off RRP*Used from £9,795
Hyundai Tucson

Hyundai Tucson

RRP £29,840Avg. savings £5,613 off RRP*Used from £11,795
* Average savings are calculated daily based on the best dealer prices on Auto Express vs manufacturer RRP
Skip advert
Advertisement

Most Popular

BMW X3 vs Honda CR-V vs VW Tayron vs MG HS vs Range Rover Sport: five top PHEVs head to head
Top five PHEVs head to head - header with team

BMW X3 vs Honda CR-V vs VW Tayron vs MG HS vs Range Rover Sport: five top PHEVs head to head

The five top plug-in hybrid systems go head-to-head on UK roads, in the test no PHEV buyer can do without
Car group tests
17 May 2026
Battery repair black hole is putting the future of EVs under threat
Technician working on EV batteries

Battery repair black hole is putting the future of EVs under threat

Experts call for end to culture of replace rather than repair amid concerns over second-hand cars
News
13 May 2026
New Land Rover Discovery is on track as brand seeks to redefine the model in relation to Defender
Land Rover Discovery badge

New Land Rover Discovery is on track as brand seeks to redefine the model in relation to Defender

The Land Rover Discovery is set for a reboot according to JLR boss P.B Balaji
News
14 May 2026