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A survey of the European market shows used diesel engines sinking 12% in sales in one month, and the middle-aged diesel car owner discovers that the used car that seemed like a good deal today is the one that takes the longest to sell
For decades, buying a diesel car meant choosing the toughest engine in the garage, one that could handle long distances and depreciated little. This picture has turned upside down. Sales of used cars aged 5 to 15 years have dropped sharply, and the decline is even greater among diesel models, which are increasingly less sought after by used car buyers, according to the Xataka website, in a report dated July 10, 2026.
The trend has a clear direction. More and more used car buyers are switching from diesel to hybrid and electric vehicles, notes Xataka. The engine that was once king is being dethroned precisely in the resale market, where it once reigned supreme, and the depreciation follows this loss of prestige.
Why the used diesel car is the one that gets stuck the most
The survey numbers leave no doubt about who suffers the most. In the analyzed market, transactions of used cars aged 5 to 15 years fell by 8.76% in the first half, double the decline of the used car market in general, details Xataka.
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And the breakdown by fuel is even harsher. In June alone, sales of used diesel cars plummeted 12.11%, while gasoline limited the drop to 2.35%; the share of diesel in the used car market fell from 45.7% to 40.7% in a year, notes Xataka. In this editorial’s reading, duly highlighted: it’s a double blow. The middle-aged diesel car suffers for being in the least selling range, 5 to 15 years, and suffers again for being diesel, the fuel that the used car buyer is abandoning. Anyone with such a vehicle in the garage has inherited the worst of both worlds when it comes to reselling.
Who rises while diesel falls
Not every used vehicle is stagnating, and the contrast helps to understand the phenomenon. While diesel is sinking, cars over 15 years old have grown by more than 4%, and models less than a year old have held the decline to just 2.07%, according to Xataka. The market extremes, the very old and the almost new, are holding up; the diesel mid-range is what’s plummeting.
There is logic behind this resistance at the extremes, as interpreted by this editorial, duly noted. Cars over 15 years old are sought after by those with tight budgets looking for the lowest possible price, regardless of the fuel; and models less than a year old are almost always sold by professionals, with warranty and provenance, which provides security to the buyer. The 5 to 15-year-old diesel car is at the worst point of this curve: too old to have a warranty, too new to be cheap, and with the fuel that the market is leaving behind. It’s the portrait of a vehicle squeezed from all sides at the time of resale.
And the electrified vehicles are experiencing the opposite of diesel. Used electric cars soared by more than 70% in volume in a single month, and hybrids also grew; electrified propulsion already accounts for almost a fifth of used car sales, reports Xataka. It’s a reversal of value: the electric vehicle, which suffered from depreciation, is now appreciating in resale, while diesel is going the opposite way. In observation by this editorial, duly noted: the used market has become a thermometer of the transition. A few years ago, a used electric car was something nobody wanted; today it’s what is growing the most, while diesel, once the favorite, is what’s stagnating. The measure of what is considered a good deal has completely shifted.
What a diesel car owner should know before selling
It’s worth translating the numbers into a decision, as interpreted by this editorial, duly noted. For those who already have a 5 to 15-year-old diesel car, the lesson from the survey is that depreciation is here to stay, and holding onto the vehicle hoping for a price improvement tends to worsen the situation, because the downward trend is consolidated. Selling earlier, even below the desired price, usually hurts less than reselling later.
This accelerated depreciation has concrete causes, still under noted observation. The mid-age diesel car usually falls out of warranty, has more expensive maintenance than a gasoline engine, and carries the stigma, not always fair, of being less reliable with age. Add to this the wave of environmental restrictions on fossil fuels advancing worldwide, and the result is a vehicle that buyers view with suspicion. Each of these factors pushes the price down, and together they explain why reselling a used diesel has become a headache.
And for those thinking about buying, the reading is the same with a cool head: a used diesel car may have an attractive price today precisely because few want it, but whoever buys it inherits the resale difficulty in the future. The discount at the start can turn into a loss at the end. The math only works out for those who will really use diesel for what it does well, driving many kilometers with fuel economy, and not as an investment that easily resells.
The Brazilian case: SUVs and pickups in focus
In Brazil, the picture has its own cut, in reading from this editorial, duly signaled. Here, diesel passenger cars are restricted by law, and the engine appears mainly in large SUVs and medium pickups, like those that dominate the premium segment in the countryside and agribusiness. It is in this universe that the discussion about resale and depreciation of diesel hits the Brazilian’s pocket harder, because these are expensive vehicles, with a high ticket, where rapid depreciation means many thousands of reais less at the time of resale. The international movement that Xataka describes is an early warning of what electrification can do to the depreciation of used diesel also here. Tell us in the comments: would you buy a used diesel car today, or are you already on the team that only looks at hybrids and electrics?
Watch: is it still worth buying a diesel car?
The debate about the value of diesel has already sparked discussion in video format in Brazil. The channel Vrum, from Estadão, published “Is it still worth buying a diesel car?”, where experts discuss the cost, maintenance, and resale of the diesel engine, exactly the dilemma that Xataka shows in numbers.
