Skip advert
Advertisement

Mercedes SLK 350

We've driven the new V6 drop-top – it's the fastest Mercedes roadster currently on sale

Find your Mercedes SLK
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

It's amazing that the SLK has been so comprehensively improved over its predecessor, yet still leaves us cold. The 350 appeals with its seductive looks and aggressive sound, but the dynamics don’t live up to the promise of the sporty styling. And although this car offers serious performance, lesser models are easier to live with day-to-day. If you’re after a truly hardcore version, we’d wait for the SLK 55 AMG.

Advertisement - Article continues below

The SLK 350 is the quickest version of Mercedes’ roadster currently on sale, and we’ve driven it on UK roads for the first time.

This car will top the range until the V8-powered SLK 55 AMG arrives later next year, although it doesn’t exactly feel underpowered or slow.

Video: watch CarBuyer's video review of the Mercedes SLK

[[{"type":"media","view_mode":"content_narrow","fid":"68677","attributes":{"alt":"","class":"media-image"}}]]

The 3.5-litre V6 under the bonnet delivers 302bhp to the rear wheels, and makes a terrific, throaty howl once you start exploring the upper reaches of the rev range.

It’s mated to the latest version of Mercedes’ 7G Tronic auto gearbox, and when this is set up in sport mode, the SLK 350 blasts from 0-62mph in only 5.6 seconds.

More impressive than this pace, though, is the new car’s efficiency. Considering the power on tap, the 39.8mpg combined economy figure is truly remarkable. The stop-start system is central to this, and it ensures that, when you drive sensibly, you can go a lot further on a single tank of petrol than you might expect.

Drop the folding hard-top, and the V6 sounds even more fantastic. Plus, the 350 comes with all the high-performance details you expect. It rides on a set of 18-inch AMG alloy wheels, and also features lowered sports suspension, a pair of chrome tailpipes and racy red seatbelts.

In addition, our car came fitted with the £215 Direct Steering option. Mercedes claims this speed-sensitive set-up provides better feel than the standard steering, although we found it didn’t deliver sufficient feedback.

It was rather numb, and lacked turn-in bite. The firm, bouncy ride exacerbates the problem, as the car rarely feels composed enough to corner with total confidence. All this seems at odds 

with the lavish new interior, which uses SLS-inspired switchgear and cowled instruments to give the look and feel of a more expensive grand tourer, albeit with more compact dimensions.

This mixed approach makes the SLK hard to pin down. It’s not sharp enough to challenge rivals from Porsche and BMW for driver fun, but not comfortable enough to be a wafting summer crusier. Hopefully, the upcoming AMG version will provide a much more focused experience.

Skip advert
Advertisement

New & used car deals

Volkswagen Tiguan

Volkswagen Tiguan

RRP £38,050Avg. savings £3,308 off RRP*Used from £23,020
Hyundai Tucson

Hyundai Tucson

RRP £11,660Avg. savings £4,230 off RRP*Used from £11,660
Volkswagen Golf

Volkswagen Golf

RRP £12,795Avg. savings £2,429 off RRP*Used from £10,895
Nissan Juke

Nissan Juke

RRP £9,750Avg. savings £4,806 off RRP*Used from £7,999
* Average savings are calculated daily based on the best dealer prices on Auto Express vs manufacturer RRP
Skip advert
Advertisement

Most Popular

New Mercedes-AMG GT SUV: the Porsche Cayenne’s worst nightmare is here
Richard Ingram with the Mercedes-AMG GT SUV

New Mercedes-AMG GT SUV: the Porsche Cayenne’s worst nightmare is here

Featuring three axial flux motors and up to 1,153bhp, Merc’s calling its new AMG ‘the hi-tech SUV with sports-car DNA’
News
17 Oct 2026
Car Deal of the Day: award-winning Cupra Raval for £216 per month
Cupra Raval - front

Car Deal of the Day: award-winning Cupra Raval for £216 per month

The 2026 Auto Express Supermini of the Year is our Deal of the Day for 18 October
News
18 Oct 2026
iCaur V25 is a new low-budget baby Land Rover from China
New iCaur V25 2026 - front static

iCaur V25 is a new low-budget baby Land Rover from China

Chery’s iCaur brand has revealed a boxy-looking car to slot between the V23 and V27, but it’s not clear if it’ll make it to the UK
News
19 Oct 2026