Question

What is a car's service history, and does a full one actually matter?

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Answer

The documented record of maintenance carried out on a vehicle — and it matters substantially, both as evidence of care and as a direct effect on resale value, which is usually the largest cost of owning a car.

What it should contain: dated records of each service with mileage, what was done, parts replaced, and who did it; cambelt or timing chain replacement, which is a major item with a specified interval; brake fluid and coolant changes; and MOT history, which is independently verifiable online and is the one part nobody can falsify.

The forms it takes:

A stamped service book, the traditional record — and the easiest to forge, which is why it alone is weak evidence.

Digital service records, held by the manufacturer and accessible through a franchised dealer. Harder to fake and increasingly standard.

Invoices, which are the strongest evidence because they show parts, labour and cost, and can be traced to the garage.

"Full main dealer" versus "full service history". Main dealer history commands a premium on premium and newer cars. On older vehicles, a complete independent specialist history is frequently equally good — and block exemption rules mean using an independent garage does not void a manufacturer's warranty, provided the correct schedule and specification parts are used. Many owners do not know this and pay dealer prices unnecessarily.

Why it affects value so much. A buyer cannot inspect internal wear. Service history is a proxy for how the car was treated, and its absence forces the buyer to assume the worst — so a gap costs more than the service would have.

What to check when buying:

Consistency between mileage and dates, which is how clocking is detected.

MOT history online, comparing recorded mileages and advisories over time — advisories tell you what has been deteriorating.

Whether major interval items were actually done, particularly the cambelt, since replacement is expensive and failure is catastrophic.

Gaps, and whether the explanation is plausible.

Keep your own records — invoices, photographs and receipts — from the day you buy.

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