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Should you still buy a diesel car in 2018?

Published: 06 November 2018

 Trend-spotting: is derv's time over?
 What’s going to happen to diesel cars?
 Should you buy a diesel in 2018?

Parsimonious, low-CO2 diesel cars were not long ago hailed as the answer to hard-pressed drivers' dreams: a fuel that cleverly managed the trick pulling off lower fuel consumption, exhaust emissions and running costs for higher miles-per-gallon fuel economy and longer range between refills. What wasn't to like?

French and Italian car makers led by the Fiat group pioneered common-rail injection and by the late 1990s the premium brigade had waded in; suddenly the BMW 330d looked appealingly fast and frugal, revolutionising the appeal of oil-burners. Britain’s motorists responded in kind: sales of diesel cars soared from just 19% of the mix back in 2007 to a record high of 56% in 2011. But then ‘VW Dieselgate’ happened in 2015, poleaxing the fuel’s appeal almost overnight.

The fall-out from the Volkswagen emissions scandal is still being felt - it’s reshaped Europe’s biggest car maker, accelerated the rise of electric cars and made diesel fuel the public enemy no.1 in some quarters of the media. But is the hype justified? Isn't diesel still a smart choice for many? And what should you do if you own a diesel car or are thinking of buying one in 2018?

Explainer: the VW emissions scandal, aka 'Dieselgate'


VW 'Dieselgate' emissions crisis: sparked a collapse in diesel car sales in the UK and across Europe

Diesel sales collapse: why Britons are being cautious

Car owners are still nervous in the aftermath of the emissions scandal, it seems. Governments in the UK and around the world are ratcheting up the anti-diesel rhetoric and diesel car tax regimes are looking less favourably on cars drinking from the black fuel pump. Since April 2018, Brits first-year vehicle excise duty (VED, or car tax) has jumped one band for diesels - and the company car tax surcharge has crept up from 3% to 4%, too. 

UK car tax explained

The result? Motorists are facing rising tax costs and the spectre of lower residual values - and are voting with their feet. After all, if buyers are deserting diesel in droves (UK sales of diesel plunged by 17% in 2017 and continue to fall dramatically this year), then surely your oil-burning car will be worth less when you come to sell it? No wonder motorists are left confused…

But what should you do? Should you consider selling your diesel car now, before values collapse? Or is this all a storm in a teacup? In this explainer, we’ll look at all the issues surrounding diesel cars in 2018 - and attempt to answer the most common questions owners are facing.

So will diesel cars be banned?

Nobody is expecting diesel to be banned outright, although some urban centres are likely to outlaw the dirtiest models. From April 2019, London’s Ultra Low Emissions Zone (ULEZ) will charge diesels that don’t meet Euro 6 regulations an extra £12.50 a day, for instance. And that's on top of the existing Congestion Charge...

Will diesel cars be banned? The future of diesel cars in 2018 hangs in the balance

It's not all bad news.

As a fuel, diesel’s been around for more a century, don’t forget; Rudolf Diesel came up with the eponymous motorised engine in the late nineteenth century and it’s worth remembering that the fuel is chemically more energy-efficient than burning petrol (hence the superior mpg and fuel economy in a low CO2 diesel car).

The good news is that modern diesel engines - those meeting Euro 6 emissions regulations, and forthcoming, even tougher EU7 limits - are impressively clean, with sufficient exhaust after-treatment built in to trap the nasties that give diesel a bad name. Forget the file pictures of dirty taxis rolled out by TV news reports; a well-maintained modern diesel won't in fact belch out black smoke in cities.

Technology such as AdBlue and diesel particulate filters (DPF) are designed to filter out the soot particulates and nitrogen oxides (NOx) emissions that have been linked to ill health. (Volkswagen was caught artificially tricking its cars’ ECU electronic brains into lowering these in lab tests to meet ever stricter emissions laws, sparking the emissions scandal that broke in autumn 2015). 

Future of diesel cars in the UK

Authorities worldwide are drawing up roadmaps to clean up internal combustion engines (ICE), as petrol and diesel cars enter their twilight years. Some countries, including Great Britain, have made grandiose pledges to phase out ICE entirely by 2040, but the reality is that most economies will still rely on fossil fuels for many years, decades even, to come. 

Opinion: our columnist Gavin Green on the future of internal combustion engines

Our view is that many drivers, especially those doing long-distance trips and motorway miles (say 20,000+ miles a year), will likely still be financially better off picking a diesel car, on account of its better mpg. Check out typical fuel economy figures in our long-term tests to calculate your expected annual fuel bills - to see if you'd be better off with a diesel car. We'd wager many motorists will still be better off at the black pump.

Old diesel car scrappage scheme aims to drive many oil-burning cars off the road

If you consider the oil refinery infrastructure and the sheer volume of diesel vehicles on British roads (the SMMT tells CAR magazine there are 13.8 million diesel cars, vans and lorries registered today), you realise that the fuel cannot simply be abolished overnight. The country simply cannot switch wholesale from or to any one fuel source, whether that’s petrol, diesel, electricity or hydrogen. This will be a phased paradigm shift, most observers agree, rather than an overnight change.

Our forecast is that diesel will continue as part of the energy mix for many years to come (albeit with a falling market share), but will continue to clean up its act with the latest technology. Future legislation in Europe will impose ever-tougher emissions controls on cars that do burn fuel. So you can expect future Euro 7 and, eventually, Euro 8 laws to clamp down on pollutants even further, meaning you can in fact buy a modern diesel car with confidence for some years to come.

Browse diesel cars for sale

Will manufacturers stop selling diesel?

This is already happening in some quarters. Porsche has become the latest car manufacturer to shun diesel engines. Chief executive Oliver Blume confirmed in autumn 2018: 'There will be no more diesels from Porsche in the future,' blaming the fall-out from the Volkswagen group emissions scandal. The company had already suspended UK sales of diesels and the news means that they won't return. It had never manufactured derv engines, instead sourcing them from sister brand Audi for its SUVs like the Macan and Cayenne. But now it's clear the sports car make is betting big on its hybrids and electric cars taking over in future.

Meet the Porsche Taycan - the first electric Porsche

Suzuki has paused supply of diesel engines for the UK market, although you can still buy oil-burners from stock, and Toyota is gradually axing its diesel models from its entire car range (though its commercial vehicles and pick-ups will continue with derv versions for the foreseeable future). Much of the Fiat group, including Jeep, have pledged to phase diesel out in favour or hyrbids and plug-in cars.

Admittedly, some car makers have vested interests in continuing to sell diesel engines. Just consider your typical usage before making your mind up - and don't believe the hysterical headlines you may read in the popular press.

Trade-in diesel car: many buyers are selling their diesels and trading up to a newer, cleaner car

If you believed every news report on the telly, you could be forgiven for thinking that Volvo, for instance, will only sell electric cars from 2019, whereas in fact the Swedes will continue to sell petrol and diesel engines for many years to come (every new model launched from 2019 will be 'electrified' or part-hybridised). Most car makers agree that ICE will still make up around three-quarters of their sales, even by the middle of the next decade.

Electrification is happening, but slowly…

Should I trade in my diesel car and sell it now?

All the evidence from the major valuations services suggests that diesel car residual values are gradually falling - but they're not collapsing. Amidst all the consumer uncertainty over the fuel’s future, some buyers are shunning derv cars and considering switching back to a petrol car - or taking a leap into the electric future, with either a pure EV or a stepping-stone hybrid car.

Should you sell your diesel car? If you’re thinking of upgrading anyway, it’s definitely worth looking at some of the old diesel car scrappage schemes popping up in UK showrooms. Many manufacturers are encouraging punters to upgrade by offering generous payments towards a new car if they trade in an EU4 or earlier diesel car, and you could save thousands off a new car by taking an old diesel off the road.

Valuations experts at CAP recently studied the effects of depreciation on diesel cars, suggesting that larger diesel cars are still in demand as used purchases, owing to their superior fuel economy.

'There is no right or wrong answer when choosing a petrol or diesel car,' its experts said. 'With so many variables across the whole vehicle sector ranging from the class of vehicle to driver usage having an impact on values, some options will be more suitable for some motorists than others.’

Check the value of your car on our sister website Parkers.co.uk

I’m still not convinced by a diesel though… should I take the plunge and go for a hybrid or electric car?

Many buyers are at this crossroads in 2018. For some, being an early adopter will be anathema - a plug-in car might be suitable for their next-but-one purchase, once a better recharging infrastructure is in place - but others may find they can switch to an electric car already, especially if they do lower, more predictable mileages and have access to charging points at work and home.

If you’re wondering how much EVs cost and which the smartest recommendations are, be sure to check out our guide to the best electric cars of 2018 below.

Would you buy a diesel car in 2018? Be sure to sound off in the comments below

By Tim Pollard

Editorial director of CAR's digital publishing arm. Motoring news magnet

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