Interim, full or major service: what's actually included
Book a car service and you’ll be offered an interim, a full, or a major one, often with a manufacturer service alongside. The names sound official, but there’s no legal standard behind them — each garage defines its own. Knowing what each should include is how you avoid paying full-service money for an interim-service job.
Here’s a plain-English breakdown of what’s typically covered, how often you need each, and how to keep the paperwork that proves it was done.
Interim service — the every-six-months top-up
An interim service is the light one, aimed at high-mileage drivers who’d otherwise go too long between checks. Typically due every 6 months or 6,000 miles, whichever comes first.
What’s usually included:
- Engine oil and oil filter change
- Top-up of all fluids (coolant, brake, screen wash, power steering)
- A visual safety check — brakes, tyres, lights, wipers, steering, suspension
- Battery and exhaust check
What it does not include: the air filter, fuel filter, cabin (pollen) filter or spark plugs. It’s a safety-and-oil service, not a deep one. If you do average mileage you can usually skip it and go straight to a full service annually.
Full service — the annual standard
The full service is what most people mean by “getting the car serviced”, and it’s the one that keeps a service history intact. Due every 12 months or 12,000 miles.
It includes everything in the interim service, plus a longer list of replacements and deeper checks:
- Oil and oil filter, plus air filter and often fuel filter
- Cabin / pollen filter replacement
- More thorough brake inspection (sometimes wheels off)
- Detailed checks of suspension, steering, driveshafts and exhaust
- Spark plugs on some schedules (petrol)
A typical full service runs through 50+ check points. This is the annual baseline a well-kept car wants, and the one a buyer expects to see stamped every year.
Major service — the bigger one, every couple of years
A “major” or “advanced” service is a full service plus the longer-interval consumables that don’t need doing yearly. Often due every 2 years or 24,000 miles.
On top of the full-service list it typically adds:
- Spark plugs (if not done at the full service)
- Fuel filter (diesel)
- Brake fluid change
- Sometimes coolant or other longer-life fluids
It’s more expensive because of the extra parts and labour, but spread over two years it’s good value and keeps the bigger consumables fresh.
What none of them automatically include
This catches people out: routine services do not cover the big interval-based jobs unless you ask. The most important is the cambelt (timing belt) — typically every 4–5 years or 60,000–100,000 miles depending on the engine, and a snapped one can destroy the engine. Also outside the standard menu: clutch, brake discs/pads (replaced when worn, not on a clock), DPF service, and the MOT, which is a separate legal test, not a service.
Always check your manufacturer’s schedule for the cambelt interval and treat it as non-negotiable.
Roughly what it should cost (UK)
Prices vary by car and region, but as a guide at an independent garage:
- Interim: £80–£150
- Full: £150–£300
- Major: £250–£450
- Cambelt: £300–£700+ (more with a water pump, which is sensible to do at the same time)
Main dealers charge more; a good marque specialist often beats them and still keeps the history credible.
Keep the proof, not just the receipt
Whichever service you pay for, the value only sticks if you can prove it later. The stamp in a paper book fades, the invoice gets lost, the garage closes. Years on, a buyer can’t tell a faithfully-serviced car from a neglected one — and that gap costs you money at resale.
The Garage keeps it straight: scan each service invoice into a dated record, log the mileage, and get a reminder before the next service — and the cambelt — falls due, so the history never breaks. When you sell, it all exports as one clean pack. Pay for the service once; prove it forever.