How often should you service your car?
As a rule of thumb, most cars need a full service once a year or every 10,000 to 12,000 miles, whichever comes first. Always follow the schedule in your car’s handbook, because intervals vary by make, model and engine. Servicing is not a legal requirement, but an MOT is.
Servicing is one of those jobs that is easy to put off, especially when the car seems to be running fine. The trouble is that the parts which wear out quietly, such as oil, filters and brake fluid, rarely give you a warning before they cause a problem. Getting the timing right is mostly about knowing the rule of thumb, then checking it against what your own car actually asks for.
The common rule of thumb
For most cars, the widely used guide is a full service once a year or every 10,000 to 12,000 miles, whichever comes first. That figure has held steady for a long time because it suits the average UK driver, who covers somewhere around 7,000 to 9,000 miles a year. If you drive less than that, the yearly interval usually comes up before the mileage does. If you drive a lot, the mileage will get there first.
The phrase whichever comes first matters. Oil and other fluids age with time as well as with use, so a low-mileage car still benefits from a yearly service even if it has barely turned a wheel. Time-based and mileage-based limits are both there for a reason, and you act on whichever one you reach soonest.
Always follow the handbook
The rule of thumb is a starting point, not the final word. Every manufacturer sets its own service schedule, and modern cars can differ quite a lot. Some long-life servicing plans stretch intervals out towards 18,000 or 20,000 miles, while other engines want attention more often, particularly if you do a lot of short trips, tow, or drive in dusty or stop-start conditions. Your car’s handbook, or the digital service schedule for newer models, tells you exactly what is due and when.
If you cannot find the handbook, a good local garage can look up the correct schedule for your registration. It is worth doing, because guessing either wastes money on work you do not need yet or leaves important jobs undone.
Interim, full and major services
Most garages offer servicing at three levels, and knowing the difference helps you choose sensibly. If you want a fuller breakdown, see our guide to interim versus full servicing and what a thorough service should include.
| Service type | Usually due | What it covers |
|---|---|---|
| Interim | Every 6 months or around 6,000 miles | An oil and filter change plus core safety checks. Popular with high-mileage drivers who want a mid-year check. |
| Full | Every 12 months or 10,000 to 12,000 miles | Everything in an interim plus extra filters and more thorough inspection of brakes, suspension and the underside. |
| Major | Every 2 years or around 24,000 miles | A full service plus longer-life items such as spark plugs and brake fluid, depending on the schedule. |
High-mileage drivers often pair a full service each year with an interim service in between, so the oil is never left too long. Lower-mileage drivers may be fine with a full service annually and a major service when it falls due. Our article on what an MOT should cost is worth a look too, since many drivers book the two together to save a trip.
Time-based or mileage-based, whichever comes first
It is worth repeating because it catches people out. A service is due when you reach either the time limit or the mileage limit, not when you reach both. A retired driver doing 3,000 miles a year still needs a yearly oil change, because oil absorbs moisture and loses its protective additives over the months. A delivery driver doing 25,000 miles a year will hit the mileage figure two or three times before a year is up, and should service more often to match.
Why skipping servicing costs more later
The main reason to service on time is that it is far cheaper than the repairs it prevents. Fresh oil keeps the engine clean and properly lubricated. Old, thickened oil lets parts wear faster and can eventually starve the engine, which is one of the most expensive failures there is. A clogged air filter makes the engine work harder and use more fuel. Worn brake fluid absorbs water and reduces braking performance. None of these are dramatic on the day, but they build up.
There is a paper-trail benefit too. A complete service history reassures a future buyer and usually adds to what your car is worth. If your car is still under a manufacturer warranty, missing scheduled services can give the maker grounds to refuse a claim, which turns a skipped £150 job into a bill for hundreds or thousands. For a sense of what regular work costs, see our guide to car service costs.
Servicing is not the same as an MOT
This is the point most worth being clear on. Servicing is not required by law. An MOT is. Once a car is three years old it must pass an annual MOT to be used on the road, and driving without a valid one is an offence. The MOT is a snapshot safety and emissions test on the day, though, and it does not change your oil or replace filters. A service is the preventative maintenance that keeps the car healthy between tests. If you want to understand where the two differ, our MOT versus service guide sets it out plainly.
A simple approach
If you want an easy way to stay on top of it, note the date and mileage of your last service, then diarise the next one for either twelve months later or your car’s mileage interval, whichever you expect to reach first. Check the handbook once so you know your car’s real figures rather than relying on the average. Book a little early rather than late, and keep every invoice. Do that and you will rarely be caught out by a bill you could have avoided.
Key takeaways
- The common rule of thumb is once a year or every 10,000 to 12,000 miles, whichever comes first.
- Your car’s handbook is the real authority, and some cars have longer or shorter intervals.
- Interim, full and major services differ in how much is checked and replaced.
- Servicing is not required by law, but it protects your warranty and helps avoid bigger bills.
Frequently asked questions
Do I legally have to service my car?
No. Unlike the MOT, servicing is not a legal requirement in the UK. However, keeping to the maker’s schedule protects your warranty, keeps the car safe and reliable, and helps its resale value.
What happens if I go over the recommended interval?
Nothing happens instantly, but old oil and worn parts do their damage gradually. Going well past the interval raises the risk of faults and can invalidate a manufacturer warranty, so it is best to book as close to the due date or mileage as you can.
Can I just get an MOT instead of a service?
No. An MOT is a legal safety and emissions check at a single point in time. It does not change your oil, replace filters or carry out the preventative work a service does, so the two are not interchangeable.