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Car review: Mercedes-Benz SLK 250 CDI

Good-looking, comfortable and economical. It's hard to find anything to criticise about this Mercedes, writes car reviewer Tim Barnes-Clay.



If you really like driving then a roadster is the sort of car you probably desire – unless there’s one in your garage already.

There’s something intoxicating about two-up, open-top motoring.

Traditionally, these cars are powered with petrol.

But Mercedes-Benz has gone one further with its SLK 250 CDI Roadster and fitted a diesel engine into it.

Top of its class

While oil-burning drop-tops have been a premium-manufacturer product for a few years now, this is the first two-seat, rear-drive convertible that runs on the stuff.

The 204 bhp four-cylinder lump puts the Mercedes-Benz at the top of its class in several respects.

With an average fuel consumption of 56.5 mpg it’s the most economical roadster in its sector.

The frugal fuel drinking makes the SLK 250 CDI a car with superior long-distance qualities.

It is for example quite possible to drive from a North Sea port in the UK to a beach on the Mediterranean non-stop.

0-62 mph in 6.7 seconds

Supportive sports seats, a decent suspension setup and the largest luggage capacity in this car category also do their bit to create the right conditions.

I drove the 250 CDI AMG Sport model. Thanks to bags of low down shove and a 7G-TRONIC PLUS automatic transmission, it accelerates from 0-62 mph in 6.7 seconds.

This means the car has another feather in its cap: it’s the most powerful diesel model in its class.

The result is dramatic driving enjoyment both on twisty country roads and motorway stretches.

Stunning sports car design



As it shares the same genes as other members of the SLK family, the 250 CDI combines its alert acceleration with stylish comfort, a stunning sports car design and day-to-day suitability.

The SLK 250 CDI is available with a choice of three versions of the German motor-manufacturer’s famous vario-roof – one of them the panoramic vario-roof with Magic Sky Control.

This glass top can be changed from dark to transparent at the touch of a button.

It’s clever stuff – especially if the weather means you can’t drop the roof but you still want to feel natural light flooding into the cabin.

Responsive handling

There are also three suspension versions available: a conventional steel suspension, a sports suspension with a stiffer spring and damper setup or a suspension with an electronically controlled, automatic damping system.

The latter is part of the Dynamic Handling package, which also includes the Direct-Steer system and the Torque Vectoring Brake developed by Mercedes-Benz for particularly responsive and predictable handling characteristics.

The SLK 250 CDI went on sale in 2012, yet it still looks like it’s just rolled out of the Mercedes-Benz design studios.

Externally it’s no different in appearance from the petrol models.

It even retains the twin exhaust system, and therefore has the same electrifying look for which all the SLK models are known.

Priced above £35,000

To be honest, there are so few areas for criticism.

The motor is what it is: a two-seater sports car, so there’s little point moaning about lack of space for the dog and kids.

Sure, I can see some petrol-purists turning their nose up at a diesel offering.

But with the SLK 250 CDI’s pulling power and economy, it’s obvious why it’s such a good choice – even if you do need over £35,000 to afford a brand new one.

Mercedes-Benz SLK 250 CDI: Pros & cons

  • Sporty √
  • Economical  √
  • Good-looking √
  • Comfortable √
  • Costly X

Mercedes-Benz SLK 250 CDI: Fast facts:

  • Max speed: 151 mph
  • 0-62 mph: 6.7 secs
  • Combined mpg: 56.5
  • Engine: 2143cc 4 cylinder 16 valve turbo diesel
  • Max. power (bhp): 204 at 4200 rpm
  • Max. torque (lb/ft): 368 at 1600-1800 rpm
  • CO2: 132 g/km
  • Price: £36,615

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Tim Barnes-Clay

Leon Poultney

Tim is an experienced motoring writer with a background in radio and TV journalism. He puts his pedal to the metal each week with his must-read car reviews.

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