How to Check a Car's Service History Is Genuine

A car's service history is only valuable if it is real. Forged stamps, invented receipts and selectively missing pages are common enough in the used market that every buyer should spend ten minutes verifying what they are shown before handing over any money.

Why It Matters

A genuine full service history (FSH) tells you the oil, filters, brakes and other wear items have been changed on schedule, that a trained eye has inspected the car regularly, and that the mileage recorded at each visit is consistent. Gaps, inconsistencies or outright forgeries are a signal that the car may have been neglected, clocked or both.

Start With the Free MOT History

Before you even look at the service book, check the car's MOT history from the registration number. This is free at the official DVSA checker (check your vehicle's MOT history on gov.uk). Every MOT since 2005 is recorded with the date, the mileage, the result and any advisories or failures.

Write down the mileage at each MOT and compare it with the mileages stamped in the service book. They should form a smooth, rising line. A service stamp showing 40,000 miles between two MOT results that never exceed 35,000 miles is a clear sign something is wrong. Equally, if the odometer falls between two tests, that is a classic clocking indicator or a tester error worth querying.

The MOT history also shows you the car's real condition over time. Repeated advisories for brake wear, suspension play or oil leaks tell you more about how the car has been maintained than any stamp can.

Check the V5C Against the Service Book

The V5C logbook records the make, colour, fuel type, engine size and year of first registration. It does not record the model name, so the service book or invoices should match the engine size and fuel type shown on the V5C. If the service book says "2.0 TDI" but the V5C shows a 1.6-litre diesel, someone has used the wrong book.

Also check that the date of first registration on the V5C matches the first stamp in the service book. A stamp dated before the car was registered is an obvious red flag.

Examine the Stamps Themselves

Genuine franchise dealer stamps usually include:

• The dealership name, address and phone number
• A printed or signed technician entry
• Consistent ink and font that matches the dealership's era
• A stamp that sits squarely in the box rather than at an angle

Independent garage stamps are perfectly legitimate, but they should still include contact details you can verify. Take a photograph of every stamp, then spend five minutes checking that each garage or dealership still exists at that address. A quick phone call to confirm "you serviced a [make and colour] with this registration in [year]" takes two minutes and dealerships are generally happy to confirm it.

Be sceptical of:

• Stamps with no business name or address
• Identical handwriting across supposedly different garages
• Stamps that look photocopied or printed rather than inked
• Pages that have clearly been removed and reinserted

Ask for Invoices

Any reputable garage, dealer or independent, will have issued an invoice for every service. Ask the seller for these. A genuine invoice will show the registration number, the mileage at the time, the work carried out and the parts fitted. It will match the stamp date. If the seller says they have "lost the invoices but the stamps are all there," treat that with caution.

For cars still within a main dealer service plan or manufacturer warranty, the service history is often stored digitally. Ask the seller to log in to the manufacturer's portal with you present, or ask a franchised dealer to check it against the VIN (the 17-character chassis number stamped in the windscreen and on a plate in the engine bay).

Cross-Check Mileage Consistently

Build a simple timeline:

Date	Source	Mileage
First registration	V5C	0
Service 1	Service book	X
MOT 1	DVSA record	Y
Service 2	Service book	Z
MOT 2	DVSA record	W

Every figure should be higher than the one above it, and the gap between services should be plausible, typically 10,000 to 12,000 miles or twelve months, whichever comes first, though some manufacturers specify different intervals.

What the Free Check Cannot Tell You

The free MOT and tax status check from the registration number will confirm the current MOT expiry, the tax status, the make, colour, engine size and year. It will not reveal outstanding finance, a stolen marker or an insurance write-off category (A, B, S or N). If the service history looks genuine but you want to be sure the car has a clean background, a paid history check will cover those areas. That is a separate step but worth considering before you commit.

When to Walk Away

Walk away if:

• The mileage in the service book contradicts the MOT history at any point
• The seller cannot provide contact details for any of the garages used
• Pages have been removed from the service book
• The seller becomes defensive when you ask to phone a garage to confirm a service

Missing history is not automatically a dealbreaker, a genuine owner who always used an independent and kept no paperwork is not unusual, but the price should reflect the uncertainty, and the MOT history becomes even more important in that case.

Your Next Step

Pull the free MOT history and tax status from the registration number before you visit the car. Print or screenshot the mileage table, bring it with you, and compare it stamp by stamp with the service book in front of the seller. Five minutes of preparation can save you thousands.