RAMUS INSIGHT
A stamped book isn’t always what it seems. Here’s how to read between the lines.
Service history matters enormously when buying a used Porsche — a complete, verifiable record can add 20% or more to a car’s value and tells you far more about how it’s been treated than any amount of visual inspection. But stamps in a book aren’t automatically genuine. Knowing what to look for, and what to check against, can be the difference between a sound purchase and an expensive one.
Start with the MOT history
The free MOT history check at gov.uk/check-mot-history is your first and most powerful tool. It gives you every MOT result going back to 2005, with recorded mileages at each test. Plot those mileages against the service stamps in the book. If a stamp claims the car was serviced at 40,000 miles but the MOT records show it was tested at 38,000 miles six months earlier and 45,000 miles six months later, the mileage on that stamp looks suspicious. Inconsistencies don’t always mean fraud — odometers get replaced, private plates get changed — but any anomaly is worth questioning.
Check the Porsche digital service record
Porsche has maintained a digital service record system for cars serviced at authorised Porsche Centres from 2012 onwards. Any Porsche Centre can access this using the car’s VIN and print a record of all dealer-performed services, including action codes and dates. If the seller claims full Porsche Centre history but the digital record doesn’t match what’s in the book, that tells you something. Note that this system only covers official Porsche Centre work — independent specialist services, however thorough, won’t appear in it.
Call the garages in the book
This is underused and surprisingly effective. Most garages retain records for several years, and many will confirm, at minimum, whether they have a record of the car being in on a given date. They won’t give you detailed invoices for a car you don’t own, but a simple “yes, we have a record of that car” or “we have no record of that registration” is valuable information. Cross-reference the name and phone number on each stamp before you call — some stamps have been known to use closed or non-existent garages.
Look at the book itself
Genuine service books accumulate naturally — the ink ages, the pages soften, stamps from different years look slightly different because stamp pads wear and get replaced. A book where every stamp looks identical in colour, depth, and alignment is a red flag. Look for natural variation. Check whether the stamps correspond to the actual franchised dealers that existed at the time — a quick search will tell you if a particular dealership was trading under that name in that year. Check that intervals make sense for the model’s service schedule.
Ask for the invoices
A stamp confirms a car visited a workshop. An invoice confirms what was actually done and what was paid for it. Genuine service invoices itemise parts, labour, and mileage. For higher-value or higher-mileage cars, asking to see supporting invoices alongside the book is entirely reasonable and any seller with a legitimate history should be able to produce them, at least for recent services.
Independent history is still valid history
A common misconception is that only main dealer stamps count. They don’t. A Porsche serviced throughout its life by a reputable independent specialist — with invoices showing genuine parts, correct oil grades, and adherence to the service schedule — is every bit as well maintained as one stamped by a franchised dealer. What matters is the quality and consistency of the work, not the letterhead on the invoice. At Ramus we record all work carried out against the car’s registration and VIN, so our customers always have a verifiable paper trail regardless of what a main dealer digital record shows.
If you’re buying a Porsche and want a specialist to assess what the service history tells you, or doesn’t, talk to the team at Ramus.
