The used-car ad terms "full service history" (FSH) and "part service history" (PSH) get used interchangeably by some sellers and pedantically by others. Neither has a legal definition. What matters is what UK buyers actually check when the car is in front of them — and that's usually stricter than sellers assume.

This guide breaks down the real difference, what each term implies, and how buyers verify each claim.

What full service history means in practice

A UK buyer treating "full service history" strictly expects:

  • Every manufacturer-recommended service interval documented. Not most. Every one. Any missing service between first registration and now disqualifies the car from "full" status in a strict buyer's eyes.
  • Major interval work carried out on schedule. Cambelt, brake fluid, gearbox oil, coolant, spark plugs — all done at or before the manufacturer's recommended mileage or age.
  • Consistent, dated, mileage-progressive documentation. Whether stamps, invoices or digital records, the timeline must hold together without gaps or contradictions.
  • MOT history unbroken from year three. No years missing, no long off-road gaps unexplained.

Note what's not on this list: the type of garage. FSH does not require main-dealer service history. A car serviced consistently at a good independent specialist has "full service history" as legitimately as one serviced at the franchised dealer.

What full main-dealer service history adds

FMDSH — full main-dealer service history — is a stricter subset. Every service must be at the franchised dealer for that brand. It's most common on cars under 5 years old and cars still within manufacturer warranty periods.

The value premium for FMDSH over independent-specialist FSH is real but often overstated:

  • Cars under 3 years old — £300–£800 premium is typical
  • Cars 3–7 years old — £100–£400 premium
  • Cars over 7 years old — usually negligible, often zero
  • Enthusiast marques (Porsche, BMW M, Audi RS, AMG) — premium can be higher, and specialist history is treated closer to main-dealer than independent

For most UK cars, chasing a main-dealer stamp when a good independent specialist would do the same work for 30–50% less isn't worth it after the first few years.

What part service history actually means

PSH is honest shorthand for "some documented, some missing". There's no threshold — a car with one missing service and a car with only the last three years documented can both be legitimately listed as PSH.

The problem is that sellers use PSH to mean everything from "one service missing on an otherwise perfect record" to "here's a shoebox with four invoices spanning 12 years". Both are technically PSH but they're not the same car.

Honest PSH listings specify:

  • What service events are documented
  • What's missing
  • Whether major interval work (cambelt, etc.) is included in the documented set

An ad saying "PSH — last four years documented at [named garage], cambelt receipt in file, pre-2021 history not with car" is worth more than "PSH available" as a bare claim.

The actual checks a UK buyer runs

Regardless of what the ad says, a serious buyer runs the same checks on any used car:

One — DVLA MOT history. Free at check-mot.service.gov.uk. Confirms mileage progression, MOT gaps, advisories and defect items. See our complete guide to checking MOT history.

Two — service document review. The buyer wants to see the actual paperwork. Dates, mileage, garage, work done. Cross-referenced against the MOT mileage record.

Three — major interval verification. For any car past major service intervals (cambelt on belt-driven engines, brake fluid, gearbox oil), the buyer asks for the specific receipt. If it's not there, they price the missing work into their offer.

Four — advisory follow-through. If the last MOT flagged advisories, the buyer wants to know they've been addressed — and often wants to see the invoice.

Five — digital service record where applicable. For main-dealer FMDSH claims, the buyer can ask any franchised dealer for the same brand to print the DSR. The dealer will do this for the current keeper — it's a fast and definitive check.

The interesting point: this checklist is identical whether the ad says FSH or PSH. What the ad calls the history matters less than what the paperwork actually shows.

The value gap between FSH and PSH

Auto Trader's own valuation data consistently shows FSH commanding a 10–25% premium over the same car with no history. PSH sits in the middle, with the exact position depending on how much is missing and how it's presented.

Rough rule of thumb on a £15,000 UK car:

  • Full service history — £15,000 asking price
  • Part service history, recent 4+ years documented — £14,000–£14,500
  • Part service history, patchy documentation — £13,000–£13,500
  • No service history — £11,500–£13,000

The gap between "PSH, well presented" and "PSH, badly presented" is often larger than the gap between "PSH, well presented" and "FSH". Presentation is doing a lot of the work.

How to move from PSH to FSH before selling

If you're preparing a car for sale and your history has gaps, three moves usually recover most of the value:

One — rebuild what you can. Call every garage the car has been to. Most keep records for 6–7 years and will reprint invoices. See our full guide to rebuilding lost service history.

Two — document major interval work explicitly. Even if service history is patchy, a clear cambelt receipt at the correct mileage does disproportionate work. Same for brake fluid, gearbox oil and any recent big-ticket work.

Three — present a summary sheet. One page listing every documented service by date and mileage, with source references. A buyer who can verify the history in two minutes rather than 20 pays closer to the asking price.

This is what a sale-ready PDF from AutoArchive is designed to produce automatically — verified records on one page, source documents attached, gaps flagged honestly rather than hidden.

Related reading: how to prove full service history when selling and digital service record versus paper service book.

The bottom line

Full versus part service history is less about a label and more about what a buyer can verify in the hour they spend looking at your car. Full history well documented sells for full money. Part history well documented sells for close to full money. Full history claimed but poorly documented sells for less than either. Presentation compounds.