Understand why MOT mileage can appear inconsistent and how to investigate possible clocking, entry mistakes or instrument changes.
An MOT mileage discrepancy means the recorded figures do not follow the progression you would normally expect. A later mileage may be lower than an earlier reading, or the pattern may contain a jump that does not fit the vehicle's history.
That does not automatically prove clocking. Test-station entry mistakes, kilometres being entered instead of miles, replacement instrument clusters and historic data issues can all create unusual records.
Start by comparing every available MOT reading in date order. Then check service invoices, workshop records, digital service history, previous adverts and any other documents carrying both dates and mileages.
Ask the seller for an explanation before you make assumptions. A credible explanation should normally be supported by paperwork rather than only a verbal reassurance.
If the discrepancy cannot be resolved, treat the stated mileage as uncertain. That uncertainty can affect value, servicing decisions and whether the car is right for you.
What a useful MOT-history review should include
MOT history is most valuable as a chronology. The aim is to understand whether mileage, maintenance and defects follow a believable pattern over time.
What to check
Read tests in date order instead of only checking the latest result.
Compare every recorded mileage point for unexpected drops or jumps.
Identify recurring advisories and defects.
Look for long gaps between tests or clusters of failures.
Why it matters
A clean recent test can sit on top of years of repeated wear-related advisories. That does not automatically make the vehicle unsuitable, but it can reveal where repair evidence or a closer inspection is sensible.
What the data cannot prove
MOT records are test records, not a full service history. They do not record every repair, accident or ownership event and they should not be used as the only evidence when buying a car.
