Interim vs Full vs Major Service — Which Does Your Car Need?

One of the most common questions we hear at Watford MOT Centre is: 'What service does my car actually need?' The answer depends on your car's age, mileage, and when it was last serviced. Here is a straightforward guide.

Interim Service — Every 6 Months or 6,000 Miles: An interim service is designed for higher-mileage drivers who cover more than 12,000 miles per year. It covers the essentials: engine oil and filter change, tyre pressure and condition check, brake fluid level, battery test, lights, wipers and top-up of all fluids. It keeps the car safe and the engine fresh between full annual services.

Full Service — Every 12 Months or 12,000 Miles: A full annual service covers everything in an interim service, plus: spark plugs (petrol), fuel filter, cabin/pollen filter, full brake inspection with measurements, coolant condition check, and a thorough 50-point vehicle inspection. This is the standard annual service recommended for most cars.

Major Service — Every 2 Years or 24,000 Miles: A major service goes further still. In addition to everything in the full service, it includes: a visual timing belt inspection (checking for cracking, fraying, glazing and correct tension), gearbox fluid check, power steering fluid check, a comprehensive suspension and steering inspection, and a full road test. This is the manufacturer-level service that protects your warranty and catches problems before they become expensive.

Please note: the timing belt inspection included in a Major Service is a visual check of the belt's condition. It does not include removing the belt, replacing the tensioner or idler pulleys, or replacing the belt itself — that is a separate, specific job. If your timing belt is due for replacement (typically every 60,000–100,000 miles or 4–5 years), see our dedicated Timing Belt Replacement page for exactly what's involved and separate pricing.

Which Do You Need? If your car is due a service but you are not sure which type, bring it in and we will check your service history and advise you honestly — no upselling, just the service your car genuinely needs.

Watford MOT Centre: Unit 1D, 6 Greycaine Road, Watford WD24 7GP. Call 07311 226 868. Open Mon–Fri 08:00–18:30, Sat 09:00–16:30.

Ready to book? See our servicing prices (Interim £99, Full from £140, Major from £199), or send a booking request on WhatsApp — we reply straight away.