What’s the Difference Between Interim, Full and Major Car Services?
22 October 2025
When it comes to keeping your vehicle in top condition, regular servicing is key. But with different types of car service available, you might be wondering what the difference is between interim, full, and major car servicing. Understanding each option can help you stay on top of your car’s maintenance needs and avoid unexpected breakdowns or costly repairs.
In this guide, we’ll break down the main differences between interim, full and major car services, explain when each one is recommended, and help you decide which is right for your vehicle.
What is an interim service?
An interim service is the most basic form of car servicing and is typically recommended every 6 months or 6,000 miles - whichever comes first. It’s designed for high-mileage drivers who need a more frequent check-up between annual services.
What’s included in an interim service?
An interim service includes around 30-35 checks, focusing on the essentials. These typically include:
Engine oil and oil filter change
Fluid level checks (coolant, brake, screen wash)
Brake checks
Tyre pressure and tread depth
Lights, indicators, and horn function
Windscreen wiper condition
Battery condition
While it doesn’t go into as much depth as a full service, it helps identify any immediate issues and keeps your vehicle safe and roadworthy in the short term.
What is a full service?
A full service is more thorough and is generally recommended every 12 months or 12,000 miles. It includes a broader inspection of your vehicle’s condition and provides preventative maintenance to extend your car’s life.
What’s included in a full service?
A full service includes all interim service items, plus additional checks such as:
Air filter replacement
Fuel filter check (for diesel vehicles)
Steering and suspension checks
Cooling system and radiator inspection
Exhaust system inspection
Detailed brake inspection
Drive belt check
A full service is ideal for keeping your vehicle in good health year-round and can even improve fuel efficiency and performance.
What is a major service?
A major service is the most comprehensive vehicle check-up and is usually carried out every 24 months or 24,000 miles. It includes everything from a full service plus several replacements and deeper inspections.
What’s included in a major service?
A major service covers all items from the full service, and often includes:
Cabin/pollen filter replacement
Brake fluid replacement
Spark plug replacement (petrol vehicles)
Transmission fluid check
Wheel alignment and balancing check
Comprehensive electrical system inspection
It’s designed to replace parts and fluids that don’t need attention every year but can wear down over time. If you’re planning a long journey or haven’t serviced your car in a while, a major service is the best choice.
Why is regular servicing important?
Regular vehicle servicing ensures that:
Your car remains safe to drive
Small issues are caught early before they become costly repairs
You maintain your vehicle’s value and efficiency
Warranty requirements are met
While MOTs are a legal requirement to check your car's roadworthiness, a service checks its overall health. MOTs don’t cover engine condition, fluid levels, or part replacements - which is why servicing is essential.
Which service do I need?
Here’s a quick way to decide:
Interim Service: every 6 months or 6,000 miles. Ideal for high-mileage drivers or vehicles used frequently.
Full Service: every 12 months or 12,000 miles. Suitable for average drivers or annual servicing.
Major Service: every 24 months or 24,000 miles. Best for older cars or vehicles overdue for a service.
If in doubt, check your car’s manual or speak to a trusted mechanic.
Book your car service in Longton
At Adderley Green Garage in Longton, we offer interim, full and major car servicing for a range of vehicles, including cars and vans, light commercial vehicles (LGVs) and motorbikes and motorhomes
Whether you’re looking for a quick oil change or a full health check, our experienced mechanics will ensure your vehicle runs smoothly and safely.
Understanding the difference between interim, full and major services helps you make informed decisions about your vehicle’s care. Staying on top of your car servicing schedule is one of the easiest ways to avoid breakdowns, reduce repair costs, and stay road-safe.
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When it comes to keeping your vehicle in top condition, regular servicing is key. But with different types of car service available, you might be wondering what the difference is between interim, full, and major car servicing. Understanding each option can help you stay on top of your car’s maintenance needs and avoid unexpected breakdowns or […]