You'd expect used listings to thin out steadily with age — plenty of recent cars, fewer old ones, tapering into nothing. Count them properly and there's a distinct hump.
| Model year | Listings | |
|---|---|---|
| 2015 | 23,232 | Peak supply |
| 2017 | 21,769 | |
| 2016 | 21,504 |
Why the peak sits where it does
Two forces meet in the middle. Newer cars are locked up — in finance agreements, in leases that haven't matured, in the hands of owners with no reason to sell. Older cars have started leaving the road for good.
Between those, around the ten-year mark, you get maximum liquidity: the finance is long paid off, the car is worth enough to be worth selling rather than scrapping, and the owner is at the stage where the next repair bill prompts a decision.
The mid-2010s also happen to be a genuine production high point. The US market was recovering hard from the 2009 collapse and volumes were climbing. More cars built means more cars circulating a decade later.
Supply is leverage
23,232 listings for one model year means something specific when you're standing in front of a seller: you are not short of alternatives, and the seller knows it.
Compare that to shopping a three-year-old car, where supply is thin, prices are firm and walking away means waiting weeks for another one. At the peak, walking away costs you nothing. There are thousands more.
That's the strongest negotiating position available in the used market, and it's free.
What you're buying into
The catch is that a ten-year-old car sits right at the end of the steep section of the complaint curve — around 35 complaints per model year, five times what a two-year-old car generates. The supply is abundant because these cars are at the age where owners start deciding whether to keep spending on them.
So the peak year is where the choice is widest and the variance is widest too. A well-maintained 2015 with records is a genuinely good buy. A neglected one is somebody else's deferred maintenance bill with a price tag on it, and from the outside they look the same.
How to shop the peak
Use the volume. Line up three or four candidates before you contact anyone. With this much supply you can afford to be the buyer who walks, and that alone moves the price.
Let the records decide it. At this age, service history is worth more than trim level or colour. A car with the timing components, water pump and suspension already done has had the expensive part of its life paid for by someone else.
Check each one individually. Model-year statistics tell you about the market, not the car. A VIN check gives you the ownership chain, mileage record and open recalls for that specific vehicle — with thousands of alternatives available, there's no reason to accept one with a story you can't verify. We covered why the odometer in particular deserves scrutiny in what counts as high mileage.
Frequently asked questions
What is the most common model year on the used market?
2015, with 23,232 listings in our data, ahead of 2017 at 21,769 and 2016 at 21,504. Supply peaks around the ten-year mark rather than declining smoothly from new.
Why are ten-year-old cars the most available?
Newer cars are locked in finance agreements and leases, while much older cars have left the road. Around ten years old, the finance is paid off, the car is still worth selling rather than scrapping, and repair bills prompt owners to move it on.
Is high supply good for a buyer?
Yes — it's the strongest leverage available. With thousands of comparable cars listed, walking away costs you nothing, which is a much weaker position for the seller than shopping a scarce three-year-old model.
What's the risk of buying at the supply peak?
Ten-year-old cars sit at the top of the complaint curve, around 35 reports per model year. The variance between a maintained example and a neglected one is at its widest, and the two look identical on a forecourt.
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