The best mileage check is a combination of three things: the MOT history for the car, a full vehicle history report that shows recorded mileage readings over time, and a comparison against the car's service history and physical condition. No single source is perfect, but together they make it much harder for a clocked car to slip past you.
Mileage matters because it affects value, wear and reliability. A car showing 40,000 miles that has really covered 90,000 could be thousands of pounds overpriced, and it may be closer to needing a cambelt, clutch or suspension work than you think.
What a good mileage check should show
A useful check does more than display the current odometer reading. Look for:
- A timeline of recorded readings from MOT tests, services and other data sources, with dates.
- Consistent growth in mileage from one reading to the next.
- Any mileage discrepancy flag where a later reading is lower than an earlier one.
- Average annual mileage, so you can judge whether the figure is realistic for the car's age.
Step-by-step: how to check a car's mileage properly
1. Start with the MOT history
Every MOT test records an odometer reading, and the history is free to view online using the registration number. Look for the pattern across years. Steady increases of around 7,000 to 12,000 miles a year are typical for many UK cars. Sudden drops, long flat stretches or readings that go backwards deserve questions. Also read the advisory notes: comments about heavy wear on pedals, seats or steering wheel on a low-mileage car can be a clue.
2. Run a full vehicle history check
An MOT history only covers test dates, so a wider report adds useful context. A full check can bring together mileage records from other sources and show previous keepers, plate changes, insurance write-off markers (MIAFTR categories A, B, S and N), the Police National Computer (PNC) stolen marker and any outstanding finance. Before you view the car, it is worth entering its registration on motorpeek.com to see what is on record. Treat the result as one part of your research rather than a guarantee, because not every reading ever taken is captured.
3. Compare with the service history
Ask to see the service book, invoices and any digital service records. Dates and mileages should line up with the MOT history. Be wary of missing stamps, handwriting that looks identical across many entries, or garages that cannot be traced. If you are unsure, ring the garage named on an invoice and ask whether they recorded that mileage.
4. Inspect the car itself
Wear should match the mileage. On a car claiming under 30,000 miles, expect crisp pedal rubbers, firm seat bolsters, an unworn steering wheel and tidy gear knob. Check tyre brands and condition, the condition of the driver's door hinges and the general state of the interior. A professional pre-purchase inspection is worth considering for higher-value cars.
Red flags that suggest a clocked car
- An MOT or service reading that is higher than the current dashboard figure.
- Long gaps between readings, especially where a car changed hands.
- Very low mileage for an older car with no convincing explanation or paperwork.
- Heavy interior wear that does not match the odometer.
- A seller who is reluctant to let you see documents, or who pushes you to buy quickly.
- Digital dashboards or instrument clusters that look recently replaced, with no invoice explaining why.
Limits of any mileage check
It is honest to say that mileage checks have limits. Cars less than three years old have not yet had an MOT, so there are fewer data points. Some cars have gaps in their records, and a clocker can alter the odometer shortly before a sale so the new figure looks plausible. Genuine reasons for odd readings also exist, such as a data entry mistake by a tester or a replaced instrument cluster. That is why a mismatch should prompt questions rather than an automatic conclusion.
If you find evidence the mileage has been misrepresented after buying, you may have rights under consumer law, but outcomes depend on the circumstances. Keep the advert, messages and receipts, and seek advice from Citizens Advice or Trading Standards.
The bottom line
For the best mileage check, do not rely on the dashboard or on the seller's word. Cross-reference the MOT history, a full vehicle history report and the service records, then confirm it all against how the car looks and feels. If the numbers, paperwork and wear tell the same story, you can buy with more confidence. If they do not, negotiate hard or walk away, because there is always another car.
Frequently asked questions
What is the best way to check a car's mileage?
Combine the MOT history, a full vehicle history report and the car's service records. Check that the readings rise steadily with dates, then compare them to the wear you see on the pedals, seats and steering wheel. No single source is infallible, so cross-checking is key.
Can a mileage check prove a car has been clocked?
Not always. A check can reveal a lower reading after a higher one or unusual gaps, which are strong warning signs. However, if the odometer was changed before any reading was recorded, it may not show up, so physical inspection and paperwork still matter.
Is the free MOT history enough to check mileage?
It is a good starting point because each test records an odometer reading, but it only covers MOT dates. A full history check and service records add extra context, and new cars under three years old will not have MOT readings yet.