The quickest high mileage check on a UK used car is to compare the reading on the dashboard with the mileage recorded at each MOT. If the figures rise steadily year after year and the latest MOT reading is close to what the odometer shows, the mileage is probably genuine. A drop, a long flat spell or a sudden jump is a warning sign worth questioning.
Mileage on its own does not tell you whether a car is a good buy. What matters is whether the number is believable, whether it suits the car's age and type, and whether the car has been looked after. Here is how to check all three.
What counts as high mileage in the UK?
There is no official cut-off, but a common rule of thumb is around 7,000 to 8,000 miles a year for a typical private car. On that basis, a ten-year-old car showing 70,000 to 80,000 miles is roughly average, and anything well above 100,000 miles would usually be called high mileage.
Context changes the picture. Diesel estates and company cars often cover far more miles a year, mostly on motorways, which is gentler on an engine than short urban trips. A 90,000-mile car with a full service record can be a better bet than a 40,000-mile car that has barely been serviced.
Step-by-step: how to run a high mileage check
1. Review the MOT history
MOT test results, including the odometer reading at each test, are recorded in the DVSA's MOT history data. Look at every reading in date order. You want a consistent pattern, for example 8,000 to 12,000 miles between tests, rather than erratic numbers.
2. Compare it with the odometer
Check that the dashboard reading is higher than the most recent MOT reading, and that the difference makes sense for the time since the test. If the car has covered only a few miles in 11 months, ask why.
3. Read the advisories and failures
Repeated advisories about suspension, corrosion, brakes or oil leaks can show how hard the car has lived. They can also reveal whether the owner fixed problems promptly.
4. Check the service history
Look for dated stamps or invoices that include mileage. Cambelt or timing chain work, gearbox oil changes and regular oil services matter most on higher mileage cars. Compare the servicing mileages with the MOT readings.
5. Inspect the car itself
Wear should match the claimed mileage. A worn driver's seat bolster, shiny steering wheel, tired pedal rubbers and heavy stone chips at the front do not fit a car claiming 30,000 miles.
How to spot possible clocking
Clocking means winding back the odometer to make a car look less used. It is illegal to sell a car while misrepresenting its mileage, but it still happens. Warning signs include:
- An MOT reading that is higher than the current dashboard figure
- Long periods where the mileage barely changes, then jumps
- Service stamps or invoices showing more miles than the odometer
- Wear that looks far heavier than the mileage suggests
- A seller who is vague about history or reluctant to let you inspect paperwork
Be aware of the limits. MOT readings are recorded only once a year, and a new car does not need its first MOT until it is three years old, so there can be gaps. A history check can highlight inconsistencies but cannot prove a mileage is correct, so use it alongside your own inspection.
Other checks to pair with mileage
Mileage is only one part of a car's past. Before you commit, also look at:
- Previous keepers: many owners in a short time can be a red flag
- Insurance write-off records (MIAFTR): Cat A, B, S or N markers show the car was previously written off
- Police National Computer (PNC) stolen marker: shows if the vehicle has been reported stolen
- Outstanding finance: a car with unpaid finance may not be yours to own outright
Before you view the car, enter its registration on motorpeek.com to see mileage-related MOT data alongside these other checks in one place, so you can go into the viewing with specific questions.
Is a high mileage car worth buying?
It can be, if the price reflects the miles and the paperwork backs up the story. Negotiate based on upcoming costs such as tyres, brakes, clutch, cambelt or suspension parts. Ask for a pre-purchase inspection from an independent garage or a breakdown organisation if you are unsure.
Walk away if the numbers do not add up, the seller cannot explain gaps, or the car's condition contradicts its history. There are plenty of other cars for sale, and the cost of a careful check is small compared with the cost of buying the wrong one.
Frequently asked questions
How do I check if a car's mileage is genuine?
Compare the dashboard reading with the odometer readings recorded at each MOT and with any dated service entries. The figures should rise steadily and never go backwards. Also check that wear on the seats, pedals and steering wheel matches the claimed mileage.
What is considered high mileage for a used car in the UK?
There is no official figure, but the average is often put at around 7,000 to 8,000 miles a year. A car well above that for its age, or over about 100,000 miles, is usually described as high mileage. Service history and condition matter as much as the number.
Can I see a car's mileage history for free?
Yes, MOT test results including odometer readings are published through DVSA's MOT history service, which you can search with a registration number. This shows readings at each test but not the mileage between tests, so combine it with service records and a physical inspection.