How Often Should You Service Your Car?

Where your interval actually comes from

Start with the owner's handbook or the digital service schedule for your exact model, engine and model year. That document specifies the interval, the oil specification and which items fall due at which visit. A garage's interim, full and major tiers are commercial packages built around that schedule, not a replacement for it.

If you no longer have the handbook, a franchised dealer or a competent independent with manufacturer data access can look up the schedule from your registration or VIN. Ask them to show you the schedule rather than quoting a tier from memory.

• Handbook or in-car service menu - the primary source
• Manufacturer schedule lookup by VIN - for cars with no paperwork
• Service portal or digital service record - often shows the next due date

Servicing is not a legal requirement in the UK. It is, however, frequently a condition of a manufacturer warranty, a service plan or a lease agreement.

Time versus mileage: whichever comes first

Fixed schedules normally express the interval two ways, for example a period in months alongside a mileage figure. The service is due when you reach either one. High-mileage drivers hit the mileage first; commuters doing short local trips usually hit the time limit first.

Oil does not only wear out through use. It absorbs combustion by-products, fuel and moisture, and additives deplete over time even in a car that barely moves. That is why the time limit exists at all.

Variable and condition-based servicing

Many cars from the last two decades calculate the service date from driving data: journey lengths, engine temperatures, load, revs and oil condition. The dashboard then shows a countdown or a service message.

These systems are useful but not infallible. They rely on the correct oil specification being used and the counter being reset properly at each service. If a previous garage reset the counter without doing the work, or filled the engine with the wrong grade, the countdown will be wrong. Keep the invoices as evidence of what was actually done.

• Follow the in-car indicator if your handbook says the car uses variable servicing
• Ask the garage to confirm the oil specification matches the manufacturer requirement
• Ask that the service indicator is reset correctly and recorded

When to service more often than the schedule says

Manufacturer schedules assume broadly normal use. Several common UK driving patterns are harder on oil and filters than that assumption, and most handbooks include a severe-use or arduous-conditions column for exactly this reason.

• Repeated short journeys where the engine rarely reaches full operating temperature
• Stop-start urban driving and long periods idling in traffic
• Towing a caravan or trailer, or regularly carrying heavy loads
• Frequent very short trips in a diesel with a particulate filter, where regeneration cycles may not complete
• Dusty, salty or coastal environments, and vehicles used off sealed roads

If two or more of these describe your driving, discuss the shorter interval with your garage rather than assuming the standard one is adequate.

Low-mileage and long-standing cars

A car covering two or three thousand miles a year will not reach a mileage trigger for years, but it still ages. Brake fluid absorbs moisture, coolant inhibitors deplete, rubber components perish, tyres age and batteries discharge. Time-based items such as brake fluid changes and cambelt replacement are set by years as well as miles.

For a car that stands a lot, an annual inspection is usually the sensible minimum even where the mileage suggests nothing is due.

Why an MOT is not a service

The MOT is a legal test of specified roadworthiness items on the day of the test. It does not check the internal condition of the engine, clutch or gearbox, it does not change oil or filters, and passing it does not mean the car has been maintained. Booking MOT and service together at one visit saves a trip, but they remain two separate pieces of work with two separate purposes.

A practical routine

• Find and record your model's schedule, then diary both the time and mileage triggers
• Check oil level, coolant, screenwash, tyre pressures and tread monthly between services
• Book earlier than the trigger if your driving matches a severe-use pattern
• Keep every invoice, not just the stamp, so the work done is evidenced
• Ask for the itemised checklist before agreeing a service tier