Car check mileage: reading the free record, and catching a clocked car

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Reading a mileage series like an engineer

1. Plot the trend, not the total. A typical car adds a broadly steady annual mileage. Read the MOT series year over year: a healthy record climbs consistently, and the interesting cars are the ones where the slope suddenly flattens: especially in the year or two before sale, which is exactly when clocking pays.
2. Any fall is a finding. An odometer only goes one way. A recorded reading lower than an earlier one is either a test-station typo (which happens, and is usually obvious against the surrounding years) or evidence of tampering. Either way, it is the seller's to explain with documents, not yours to explain away.
3. Cross-check against the paperwork. Service stamps, invoices and old MOT certificates each carry mileages. Lay them against the DVSA series: a service history whose numbers disagree with the test record is telling you which of the two documents was written to be believed.
4. Match the cabin to the number. Pedal rubbers, steering wheel wear, driver's seat bolster and gear knob polish all accumulate with miles and do not read the odometer. A worn-through interior on a low-mileage car is the oldest clocking signal there is, and it still works.

Why clocking persists in the digital era

Digital odometers made clocking easier, not harder: the reading is a value in memory, and the tools that rewrite it are cheap and openly sold for legitimate cluster repairs. The economics are simple (tens of thousands of miles removed can add four figures to a sale price) so the fraud concentrates on high-mileage fleet returns dressed as gentle private use.

The countermeasure is the series, because a single reading can be faked but a history has to be consistent with every record ever made. The free MOT data is the backbone; the paid checks widen it with readings from other sources and do the comparison automatically, flagging any discrepancy against the vendor's own data.

What to do when the mileage does not add up

Ask the seller directly, in writing, and keep the answer. There are innocent explanations (a genuine typo at a test station, a replaced instrument cluster with the change documented) but each of them comes with paperwork, and the absence of that paperwork is itself the answer.

Walking away is usually the right move: a clocked odometer is rarely the only dishonesty in the sale. If you have already bought, the written misdescription is the basis of the remedy, which is why the question is asked in writing before money moves.

Common questions

How can I check a car's mileage for free?

The GOV.UK MOT history returns the odometer reading recorded at every test since 2005: a free, official mileage series across the vehicle's tested life. It is the single best clocking check available at any price, and the paid products build on the same register.

What is car clocking?

Winding an odometer back to inflate a car's value: illegal to do for gain when selling, and still common because digital odometers are rewritable with cheap tools. The defence is the recorded series: every MOT reading, service stamp and invoice has to agree with the number on the dash.

Do paid checks include a mileage check?

The full checks in the table above include mileage data and flag discrepancies automatically, drawing on sources beyond the MOT lane. The advertised prices shown are quoted verbatim from each vendor's own page with the retrieval date.

A car's MOT mileage went down one year: is it clocked?

Not necessarily: single-digit-transposition typos at test stations are real and usually look obviously wrong against the surrounding years. A fall that fits a flattening trend, or paperwork that disagrees with the register, is the pattern that matters. Ask in writing and require documents.

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