Full service history is quoted in every used car advertisement and covers a wide range of actual maintenance quality.
Stamps against invoices
A stamped book records that something happened.
Which is not the same as recording what was done.
Invoices list parts and labour and are far more informative.
Interval compliance
Whether services were done at the specified mileage or time.
Which for time-based items matters even on low mileage cars.
The expensive items
Timing belts, transmission fluid and coolant.
Which are frequently skipped and expensive to discover afterwards.
Main dealer against independent
Franchised servicing costs more and is not automatically better work.
Which matters for resale value in some markets and not in others.
Specialist independents frequently know a model better than a general dealer does.
Digital service records
Manufacturers moving to electronic histories.
Which are harder to falsify and require a dealer to retrieve.
Gaps
Periods with no record at all.
Which do not prove neglect and do reduce what a buyer can verify.
Cross-checking
Inspection records, mileage histories and previous advisory notes.
Which frequently reveal more than the service book.
What to ask for
Every invoice, the inspection history and any diagnostic reports.
Which a genuine seller can usually produce.
Mileage verification
Recorded readings across services and inspections.
Which reveal inconsistencies where mileage has been altered.
National mileage databases exist in several countries and are inexpensive to check.
Advisory items
Notes on inspection reports about components approaching wear limits.
Which indicate what is likely to need attention soon.
A pattern of ignored advisories tells you about the previous owner.
Recall completion
Manufacturer safety campaigns.
Which can be checked by chassis number, usually free.
Outstanding recalls on a used purchase are common and easily fixed.
Independent inspection
A pre-purchase check by a third party.
Which costs a modest amount against the purchase price.
It regularly finds things the history does not show.
What history cannot tell you
How the car was actually driven between services.
Why documentation matters more on some vehicles
Complex, high-performance and premium models depend on maintenance more heavily.
Which makes the record proportionally more important as purchase price falls.
A cheap example of an expensive car with no history is cheap for a reason.
Common gaps to look for
Timing belt or chain service, brake fluid changes, transmission and differential fluids, and coolant.
Which are time-sensitive and frequently deferred.
Any of them can produce a repair bill exceeding the vehicle's value.
Warranty implications
Manufacturer and extended warranties requiring documented servicing.
Which is a condition rather than a suggestion.
Claims are declined on this basis regularly.
Selling your own vehicle
Keeping every invoice and presenting them in order.
Which measurably improves both price and speed of sale.
The practical checklist
Invoices rather than stamps, intervals against the schedule, mileage consistency, outstanding recalls, and an independent inspection.
Falsified records
Stamps and invoices can be produced fraudulently.
Which is uncommon and is a real risk on higher-value vehicles.
Contacting the garages named on the invoices verifies them for the cost of a phone call.
Cars with no history
Not automatically a bad purchase.
Which depends on the vehicle, the price and what an inspection finds.
Budget for immediate servicing of every time-based item and price accordingly.
Fleet and lease vehicles
Maintained to schedule and frequently driven hard.
Which produces good records and variable condition.
Building your own record
Keep a folder from the day you buy.
Which costs nothing and returns real money at sale.
What it is worth at resale
Documented history measurably improves both price achieved and time to sell.
Which makes keeping records a financial decision rather than an administrative one.
The summary
Ask for invoices rather than stamps, check the intervals against the schedule, verify the mileage, look for the expensive deferred items, and pay for an independent inspection.
The whole process costs an afternoon and a modest fee, against a purchase that costs thousands.
A general note on sources
Figures in this area come from manufacturer publications, regulator test programmes, insurance claims data and independent consumer testing, and those four sources do not always agree.
Where they conflict, the independent testing and the real-world claims data are usually the more reliable guide, because manufacturer figures are produced under conditions chosen by the manufacturer.
Anything specific to your own vehicle should be checked against its handbook and against a qualified technician familiar with the model, since specifications differ between markets and between production years in ways that general articles cannot capture.
One last practical point
Almost everything above becomes easier if you keep a simple record for your own vehicle: what was done, when, at what mileage and by whom.
It takes a folder and about five minutes a year, and it improves resale value, makes warranty claims straightforward and turns vague worries about condition into questions you can actually answer.
Owners who do this rarely get caught out, and owners who do not almost always wish they had started earlier.