New diesel sales decreased by nearly 30 percent last month, but second hand sales fared much better.

Diesels may be declining in popularity rapidly, but it seems that same trend doesn't apply in the second-hand car market.

New diesel registrations fell 28.2 percent in June, but according to new data by Auto Trader, the UKs biggest car marketplace, the 2015 diesel automatic Mitsubishi Outlander was the fastest selling used car last month. The Japanese SUV took an average of just 19 days to sell in June.

Following that was the Mazda CX-5 (2016 diesel manual), the Audi A4 Avant estate (2016 diesel automatic), and in fourth position was the manual version of the Outlander (2015 diesel.

Across much of the country, diesels were the most popular second hand cars in June. In the East Midlands the 2015 Volkswagen Passat diesel manual was the most popular, in the South East it was the 2017 Volkswagen Sharan diesel manual, the South West the 2015 Ford Juga diesel manual, Scotland the 2016 Hyundai Tucson diesel manual, and Wales the 2015 Ford Kuga diesel manual. In London and the South of England however the most popular second hand car of June was the 2015 Mitsubishi Outlander electric hybrid automatic

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'Despite what has been at times a turbulent first six months of the year, as we enter into the second half of 2018 it’s reassuring to see that consumer demand for quality used cars remains strong. However, whilst the forecast for the full year suggests a healthy H2, the market will face a number of challenges, not least the ongoing uncertainty around diesel and Brexit,' said Karolina Edwards-Smajda, Auto Trader Retailer & Consumer Products Director. ' What’s more, the new WLTP – Worldwide Harmonised Light Vehicle Test Procedure - emissions testing will no doubt have an impact on the traditional seasonal sales patterns.'

'In an increasingly challenging and competitive market, utilising data to complement your own expertise can make all the difference in helping your business stand out, create a more compelling user experience, build trust, and improve efficiencies across the business,' she added. 'Retailers using forecourt management solutions, such as i-Control, are much better set to understand which used cars are in demand in their area and how to maximise the speed of sale, and ultimately, cut costs, boost turnover and increase profit.'