Know what you’re buying
How to check a used car’s service history before buying
“Full service history” sounds reassuring, but it helps to look at the paperwork behind it. Here’s how to find out what work was done, when it was done and what you may still need to ask.
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Ask what service history is available
Before arranging a viewing, ask whether the seller has a service book, digital service history or invoices. They may be able to share relevant photos or copies, with previous owners’ personal details covered. If that isn’t possible, ask to see the records at the viewing; you don’t need the whole file before travelling.
When you can see the records, compare the dates, mileages and work listed. Check that the registration or vehicle identification number (VIN) matches the car, and ask about gaps or differences before deciding to buy.
A CarDiligence report helps you prepare by organising the service information and turning it into questions for the seller. Compare it with the car’s own service book and invoices when you see them.
A stamp in the service book can show that the car visited a garage. An invoice with a list of the work gives you more detail. If the advert says “serviced recently”, it’s worth asking what that service included and whether any other recommended work was done.
The manufacturer’s online records and invoices from independent garages may tell different parts of the story. If a record is missing, the work may still have been done. Ask for confirmation before making a decision either way.
Check what servicing this particular car needs
The manufacturer’s service schedule sets out what work is recommended and when. Make sure you have the schedule for the car’s exact engine and version; the handbook, a dealer or a specialist can help. Age, mileage and how the car is used can all affect what it needs.
- Do the records show the recommended services?
- Do the invoices list any extra work that was recommended, as well as the oil service?
- If the seller says a belt, fluid or another part was replaced, is there a dated invoice showing the mileage?
- What work is recommended next, and which records do you still need?
If you’re asking about a timing belt or chain, check the exact engine rather than relying on the model badge. These parts keep the engine’s moving parts working together. A history report can help with the records, but it cannot check their current condition.
MOT history and service history answer different questions
The official MOT history service shows the results of the car’s roadworthiness tests, recorded mileages and, where available, faults. It does not confirm that routine servicing was done. The MOT does not cover the condition of the engine, clutch or gearbox . Compare the dates and mileages with the service paperwork. If something doesn’t match, ask for an explanation; one unusual reading is not proof of dishonesty.
An example: the service is recorded, but what was done?
Example only: the advert says “full service history,” and a recent record confirms a garage visit. The seller also says the brake fluid was changed, but the record you have does not list that work.
- What the record shows
- A dated service visit is recorded.
- What still needs checking
- The entry does not say whether the brake fluid was changed.
- Ask the seller
- “Do you have an invoice showing what was changed and at what mileage? Could I see it at the viewing, or have a copy beforehand if convenient?”
- Before deciding
- Check any paperwork against the car’s service schedule. If you’re still unsure, ask a specialist what to check and what it might cost.
This is a made-up example to show how to read a service record. It does not describe a real car or mean that work is overdue.
Questions to send before a viewing
What service records do you have, and when was the last service? If it’s convenient, could you share photos of the relevant entries or invoices, with personal details covered? Otherwise, could you have them ready at the viewing, including records of any major work mentioned in the advert?
If you still have questions, more paperwork or an independent inspection may help you decide. Missing paperwork on its own cannot tell you what condition the car is in.
How CarDiligence helps
Where available, CarDiligence compares service information with the manufacturer’s maintenance guidance. Records can be incomplete or unavailable for a particular car. Missing evidence stays unverified; it is never assumed clear. Your report explains what was returned and suggests questions for the seller. See what the report checks.
See the sample report , then use the first-year budget guide to separate missing proof from estimated costs. Use the report alongside original documents, a test drive and an independent inspection.