Interim vs full service: which do you need?
An interim service is a lighter check, usually every 6 months or 6,000 miles, focused on oil and safety basics. A full service is more thorough and is done once a year or every 12,000 miles. High-mileage drivers benefit from both; average drivers usually just need the annual full service.
Both an interim and a full service keep your car healthy, but they are not the same job. Knowing the difference helps you avoid paying for more than you need, or missing maintenance you do need.
What is an interim service?
An interim service is a lighter, more frequent check, usually every six months or 6,000 miles. It focuses on an oil and filter change and safety basics: brakes, tyres, lights and key fluid levels. It is designed to keep a car reliable between full services, which is most useful if you cover high mileage.
What is a full service?
A full service is the thorough annual check, usually once a year or every 12,000 miles. It includes everything in an interim service plus a wider inspection of components and fluids. For a full breakdown, see what is included in a full service.
Interim vs full service at a glance
| Interim | Full | |
|---|---|---|
| How often | 6 months / 6,000 miles | 12 months / 12,000 miles |
| Depth | Oil and safety basics | Thorough inspection |
| Typical cost | £70 to £120 | £150 to £250 |
| Best for | High-mileage drivers | Almost everyone, yearly |
Which should you choose?
If you drive average mileage, a yearly full service is usually all you need. If you cover well over 12,000 miles a year, add an interim service in between to keep the oil fresh and catch wear early. Always follow your car handbook schedule, as some models have their own intervals. For typical prices across all service types, see our car service cost guide, and if you are unsure how a service differs from an MOT, read the difference between an MOT and a service.
Key takeaways
- Interim service: every 6 months or 6,000 miles, roughly £70 to £120.
- Full service: every 12 months or 12,000 miles, roughly £150 to £250.
- A full service covers everything an interim does, plus more.
- High-mileage drivers benefit from an interim between full services.
- Always follow your car handbook schedule where possible.
Frequently asked questions
Do I need both an interim and a full service?
Only if you cover high mileage. If you drive well over 12,000 miles a year, an interim service between your annual full services helps catch wear early. Average-mileage drivers usually just need the yearly full service.
Is an interim service worth it?
For high-mileage drivers, yes, it keeps oil fresh and catches issues between full services. For low-mileage drivers it is often unnecessary; the annual full service is enough.
What is the difference in what they check?
An interim covers an oil and filter change plus safety basics like brakes, tyres and lights. A full service adds a deeper inspection and more components and fluids.
Which is better value?
A full service covers more per pound and suits most drivers once a year. Interim services add value mainly for those doing high mileage.