Top 10 reliable new and used sports carsThe best new and used coupés and convertibles

16 February 2011

The annual Which? Car Survey is the best in Britain, giving owners the chance to say what they love or hate about their cars.

Last year, we received feedback on 66,669 cars in total, officially making the Which? Car Survey the biggest survey of car reliability and satisfaction for the fourth year running.

Using the reliability results from the 2010 Which? Car Survey, here are our top five new and top five used sports cars.

New cars were on sale new in 2010 and are up to three years old. For the purposes of our survey, used cars are aged between four and eight years old. Some cars appear more than once here due to production dates.

These results will soon be updated when the 2011 Which? Car Survey figures are in.

New sports cars and convertibles

Mercedes SLK 2Look

Mercedes SLK 2Look comes with 18-inch alloys

Mercedes-Benz SLK

Model year: 2004-

Reliability score: 93%

For the first time, Mercedes' SLK ousted the Mazda MX-5 from the top spot on our survey as the UK's most reliable sports car. The SLK provides real wind-in-your-hair thrills, particularly if you choose one of the larger engines like the 350. Faults are rare, but owners said they were most likely to relate to the onboard computer or non-engine electrics.

Read all of our Mercedes-Benz SLK reviews

Mazda MX-5

Mazda's MX-5 celebrates its 20th anniversary

Mazda MX-5

Model year: 2005-

Reliability score: 91%

The MX-5 is a first-rate buy thanks to a fun-to-drive nature, rock-solid reliability and keen prices - reflected in the stunning owner satisfaction score of 97%. Exterior (trim) faults were most common.

Read our Mazda MX-5 reviews

BMW 1 Series Convertible

Steering feels good in bends

BMW 1 Series coupé / convertible

Model year: 2008-

Reliability score: 91%

The small BMW is great to drive and has a good range of economical engines, and it's dependable too. Just one owner in 20 reported a problem - the most common issues being electrics or the sunroof.

Read all of our BMW 1 Series reviews

Audi A5 Sportback 1

A5 Sportback has five doors and a big boot 

Audi A5

Model year: 2007-

Reliabilty score: 90%

Audi's svelte coupé made big strides from 2009 to 2010; its reliability score jumped from 76% to 90%. Non-engine electrics form the bulk of complaints when they occur.

Read our Audi A5 reviews here

Saab 9-3 deals

Save 39% on a new Saab convertible

Saab 9-3 convertible

Model year: 2003-

Reliability score: 89%

The Saab 9-3 is getting on a bit now, but it's still proving reliable. The replacement 9-3 arrives soon, so generous discounts are available on the current car.

Read our Saab 9-3 reviews here

Used sports cars and convertibles

Year-old MX-5 is a bargain

Year-old MX-5 is a bargain

Mazda MX-5

Model year: 2005-

Reliability score: 89.7%

The Mazda scores highly both as a new and used buy. A reliability score of 89.7% is superb - so it's no surprise the Japanese roadster is a real Which? favourite. And as if taking top spot wasn't enough, the MX-5 has more than one entry on this list...

Honda S2000 savings

Save big bucks on outgoing S2000

Honda S2000

Model year: 1999-2009

Reliability score: 85%

The stylish S2000 has disappeared from new forecourts, but it's a sought-after used buy for its awesome high-revving performance and dependability. Non-engine electrical problems are most common.

Read our review of the Honda S2000

BMW Z4 deals

Save £9k on a used BMW Z4


Model year: 2003-2008

Reliability score: 82%

The original BMW Z4 is great to look at and a very impressive driver's car. However, the ride can be unforgiving and the bigger engines are thirsty. Once again, non-engine electrics are the most common gripe.

Read all of our BMW Z4 reviews

Huge discount on the Mercedes-Benz SLK

Huge discount on the Mercedes-Benz SLK

Mercedes-Benz SLK

Model year: 2004-

Reliability score: 81%

Like the Mazda MX-5, the SLK makes both the new and used versions of this list - a good indication that the car was well-built throughout its life. It's no surprise this simple roadster is still sought-after on the used market - it makes a great second car.

Mazda MX-5

Model year: 1998-2005

Reliability score: 78%

That a car first released 13 years ago still ranks as one of the most reliable used buys is amazing. It's a real testament to the care with which the Mk2 version of the little Mazda was built.