Interim vs full service: which does your car need?

Quick answer: an interim service is a smaller service, usually every 6 months or 6,000 miles, covering an oil and filter change plus essential safety checks. A full service is a more thorough service, usually every 12 months or 12,000 miles, that adds more filters and a wider inspection. Most drivers alternate: a full service once a year, with an interim in between if they do high mileage.

If you've ever looked at a garage price list and wondered what the difference is, you're not alone. Here's what each service is for, who it suits, and how to choose the right one for your car.

What is an interim service?

An interim service is a mid-year top-up designed for drivers who cover a lot of miles. It replaces the engine oil and oil filter, which wear out fastest, and checks the parts that most affect safety.

• How often: every 6 months or 6,000 miles, whichever comes first.
• Who it suits: high-mileage drivers, delivery and fleet vehicles, and anyone who does lots of short journeys or stop-start town driving.
• What it isn't: a replacement for your yearly full service.

See what's included and book an interim service.

What is a full service?

A full service is the main yearly service for most cars. It includes everything in an interim service, plus extra filters and a more detailed inspection of the engine, brakes, steering, suspension and electrics.

• How often: every 12 months or 12,000 miles, whichever comes first.
• Who it suits: almost every driver, as the core of a yearly maintenance routine.
• Why it matters: it catches wear before it becomes a breakdown or an MOT failure, and a stamped service history helps your car's resale value.

See what's included and book a full service.

Interim vs full service: what's checked

The exact list varies by car, but as a guide:

• Both services: engine oil and oil filter change, fluid levels topped up, lights, tyres, brakes, wipers, battery check and a road test.
• Full service adds: air filter replacement, a more detailed inspection of brakes, steering, suspension and exhaust, and checks on belts, hoses and the cooling system. Fuel and cabin filters are checked and replaced when due.

We'll always tell you the price before we start, and if we find anything else, we'll explain it and agree it with you first.

How to choose

• Under about 10,000 miles a year: a full service once a year is usually enough.
• Over about 10,000 miles a year: a full service each year, plus an interim service six months later.
• Lots of short trips or towing: consider the interim service too, as these are hard on engine oil.
• Your manufacturer's schedule comes first: some newer cars have variable service intervals shown on the dashboard. Follow your handbook or service indicator.

Not sure which you need? Our free car health check is a good starting point, and we'll recommend the right service for how you drive.

What about a major service?

Some garages offer a third, "major" service, often every two years, which can include spark plugs, brake fluid and coolant changes. At H2 Mechanics, our full service is thorough, and we'll tell you when any of these items is due, so you only pay for what your car actually needs.

Servicing and your warranty

You don't have to go back to a main dealer to keep your manufacturer's warranty. Under UK competition rules (known as block exemption), an independent garage can service your car without affecting the warranty, as long as the work follows the manufacturer's schedule and uses parts of matching quality. We do both, and stamp your service book.

Service, MOT and winter: plan them together

Many drivers book their full service at the same time as their MOT, which saves a second trip. Our MOT testing support can be booked alongside a service. Read our guide to the most common MOT failures, and our winter car checklist if your service falls in the colder months.

We service cars and vans for drivers across Bury and nearby, including Ramsbottom, Radcliffe and Prestwich, and also offer van servicing for trades and fleets.

Interim vs full service: common questions

What is the difference between an interim and a full service?

An interim service is a smaller service every 6 months or 6,000 miles, focused on an oil and filter change and safety checks. A full service is every 12 months or 12,000 miles and adds extra filters and a more detailed inspection.

Do I need an interim service if I have a full service every year?

Only if you drive a lot, usually more than about 10,000 miles a year, or do lots of short or stop-start journeys. Otherwise, a yearly full service is usually enough.

How long does a car service take?

An interim service usually takes around an hour or two, and a full service a little longer. We'll give you a collection time when you drop off.

Can I get my car serviced and MOT'd at the same time?

Yes. Many drivers book both together to save a trip. We arrange your MOT with an independent licensed centre and service the car at our workshop.

Will an independent garage service affect my car's warranty?

No, as long as the service follows the manufacturer's schedule and uses parts of matching quality. That's protected under UK competition rules, often called block exemption.