Servicing & MOT
Repairs
Tyres & Wheels
Engine & Drivetrain
Diagnostics & Emissions
Security & TechInterim vs Full vs Major Service: Which Does Your Car Need?
By Sun Garage, Owner, Sun Garage · 28 January 2026 · 5 min read
Why service names cause confusion
Garages, manufacturers and online booking sites all use slightly different names for the same handful of service levels, which makes it hard to know what you actually need. In reality there are three tiers most cars follow: interim, full and major.
At Sun Garage in West Bromwich, we always explain which level suits your car's age, mileage and how it is driven, rather than just selling the most expensive option.
Interim service: the six-month top-up
An interim service is a lighter check, typically recommended every 6 months or 6,000 miles for cars that cover a lot of miles, or as a mid-point check between full services for lower-mileage drivers.
A typical interim service includes:
- Engine oil and oil filter change
- Top-up of key fluids (coolant, brake fluid, screen wash)
- Visual check of brakes, tyres, suspension and steering
- Battery condition test
- Lights and horn check
It is not a substitute for a full service, but it is a sensible way to keep high-mileage cars – taxis, sales reps' cars, delivery vehicles – running safely between annual checks.
Full service: the annual standard
A full service is what most manufacturers recommend once a year or every 12,000 miles. It covers everything in an interim service plus a much deeper inspection.
What full adds on top of interim
Air filter and pollen filter replacement, brake pad and disc measurement, exhaust and underbody inspection, drive belt condition, and a full road test are all added to the checklist.
Who it suits
Most family cars doing average annual mileage (8,000–12,000 miles) are well served by one full service per year, timed to fit around the MOT.
Major service: the deep dive
A major service is usually needed every 2 years or 24,000 miles, whichever comes first, and includes everything in a full service plus items that only need periodic attention.
Spark plugs, brake fluid replacement (not just testing), and sometimes coolant replacement fall into this category, since these components degrade on a longer cycle than oil or filters.
Timing belts are a separate, mileage-and-age-specific job on many engines – always check your handbook, as a snapped belt on an interference engine can cause serious engine damage.
How we decide what your car needs
Rather than guessing, we check your service history, your mileage since the last visit, and the manufacturer's schedule for your specific make and model before recommending a level. If your car is due a major service but has recently had brake fluid changed elsewhere, we will not charge you to do it again.
Bring any previous service records with you, even from another garage – it helps us avoid recommending work that has already been done.
Book the right service, not just any service
Not sure which level your car is due? Give our West Bromwich team a call on 0121 553 0296 with your registration and mileage, and we will tell you honestly what it needs – nothing more, nothing less.