Used diesel car prices and values
Diesel owners have had a rough year. Analysis from Solera cap hpi says the average value of a used diesel car has fallen by 7 per cent over the last 12 months, and the firm reports that the decline sharpened from March onwards as pump prices climbed. Diesel topped £2 a litre earlier this month and is still hovering close to 200p, so there is little sign of relief.
The latest monthly figures keep the trend going. A three-year-old diesel with 60,000 miles lost another 0.6 per cent of its value in October, which makes it the weakest fuel type for a fifth month running. Self-charging hybrids rose by 0.5 per cent over the same period and electric cars edged up by 0.3 per cent.
The wider used market is calm by comparison. Solera cap hpi puts the October dip for a typical three-year-old car at 0.3 per cent, a little over £90. Diesel is falling against a steady backdrop, which is why the gap with hybrids and EVs is so visible.
How long diesel cars take to sell
The most telling figure is time on the forecourt, more so than the price drop. According to the same data, diesels sold in September took an average of 41 days to find a buyer. Hybrids took 32 days and EVs 33.
Those extra days cost dealers money, and Solera cap hpi says some are now wary of taking diesels in part exchange at all. Its head of current valuations, Chris Plumb, says diesel stock needs to be especially desirable or keenly priced to move. Anyone trading in should expect a tougher conversation about their diesel than they would have had a year ago.
Why diesel demand is falling
The fuel price accounts for most of it. Carwow reports that requests to dealers for test drives of new diesel models fell by 33 per cent between March and the end of September. Petrol demonstration requests dipped by a quarter and hybrid enquiries fell by 8 per cent, while EV enquiries rose by 28 per cent.
Carwow also says diesel interest dropped a further 14 per cent in the latest week compared with the week before. Diesels make up fewer than one in 20 new car registrations so far in 2026, and the choice of new models keeps shrinking, so there is less fresh supply to prop up the used market in the years ahead.
Carwow’s Iain Reid points out that diesel has long suited high-mileage drivers, but says the sums are shifting. Carwow’s own calculations suggest an EV can now save hundreds of pounds a year over a diesel, even when relying on public rapid chargers. That figure comes from a car-buying site, so check it against your own mileage and charging habits before treating it as fact.
Used hybrid and EV values
Hybrids are the quiet winners. Plumb says they are proving much more resilient because they cut fuel bills without asking drivers to change how they refuel. Most people do not want to rearrange their routine around a charger, and a hybrid asks nothing of them.
EVs are holding up too, with values nudging upward in October. Carwow points to newer models that can top 500 miles on a charge and add hundreds of miles in around 20 minutes on a rapid charger, which addresses the two worries buyers raise most often. Those are industry claims, so look at real-world range figures and independent tests for any specific car you are considering.
Should you sell or buy a used diesel now?
Here is how the picture looks for diesel owners and buyers.
Pros of a used diesel right now
- Prices are softening, so buyers have room to negotiate
- Still a sensible fit for long motorway mileage
- Dealers are keen to shift stock that has sat for weeks
Cons of a used diesel right now
- Values are falling faster than any other fuel type
- Pump prices are close to 200p a litre
- Part-exchange offers may come in low
- Resale could be harder in a year or two
Thinking of selling your car? See what it’s worth with a free valuation here.
Verdict
Drivers who cover big motorway miles and own their diesel outright should keep it. Selling into a weak market to chase a hybrid costs more in lost value than it saves in the short term, and a well-maintained diesel is still among the cheapest ways to cover long distances.
Drivers who do modest mileage, mostly around town, and are due a change anyway should sell sooner and look at a used hybrid. Every month of waiting looks likely to cost a bit more, and the 41-day average sale time means a sharp price is needed. Thinking of selling? See what your car is worth at regit.cars.
Anyone buying a used diesel is in a strong position. Haggle hard, and only go for one if the miles justify it.