An interim service is the shorter one — oil, oil filter and a run through the main safety checks. It suits cars doing high mileage that need attention twice a year.
A full service adds air and fuel filters, a deeper inspection and more replacement items. Most people do one full service a year, with an interim halfway through if they cover a lot of miles.
You can compare what is in each on our servicing page, or read the detail for the interim service and the full service.
If you are not sure which one you need, tell us your mileage and we will point you at the right one.