What is the difference between a service and an MOT?
They are entirely different things, and treating one as covering the other is a common and expensive mistake.
An MOT is a legal roadworthiness test, required annually in the UK for most vehicles over three years old. It is a snapshot inspection conducted to a government-defined standard, checking that the vehicle meets minimum safety and environmental requirements on the day of the test.
What it checks: brakes, tyres, lights, steering, suspension, seatbelts, mirrors, wipers, exhaust emissions, structure and corrosion in critical areas, and the horn.
What it explicitly does not check: engine condition, clutch, gearbox, or the state of any fluids. Crucially, the tester does not remove parts or dismantle anything, and the MOT makes no assessment of how long anything will last. Brake pads with 1mm remaining pass; they may need replacing next month.
Failure categories are Dangerous, Major (both fail) and Minor (pass with advisory). Advisories are worth reading carefully — they are the tester telling you what will fail next year.
A service is preventive maintenance to the manufacturer's schedule. It is not a legal requirement and is not standardised, which is why quality varies.
What a service typically includes: engine oil and filter change, other filters, fluid level checks and top-ups, brake and tyre wear measurement, suspension and steering inspection, and a general condition check.
The essential distinction: an MOT asks is this vehicle legal today? A service asks what needs attention to keep it reliable?
Service levels vary — interim, full and major, with different items included. Ask for the checklist.
Two practical points: driving without a valid MOT is an offence and typically invalidates insurance. And you can have an MOT done up to a month before expiry while keeping the original renewal date.