Scheduled servicing
There are four manufacturer-recommended scheduled service types. They are:

Pre-delivery service
A pre-delivery service is performed on a new vehicle before it is delivered to the customer. It is performed to check that the vehicle is in correct working order and is operating as the manufacturer intended. It is also the time to check that the required options are installed and dealer fitted accessories fitted.
First service
A first service is usually performed at around 1000 miles (m) or 1500 kilometers (km). Its function is to check the general condition of the vehicle, change the engine oil and make any minor adjustments. The owner may also require some early warranty repairs.
Distance-based service
Distance based services are used to maintain the vehicle at its optimum condition after a set amount of use. The distance between the services varies and can range from 3000 m or 5000 km upward depending on the manufacturer. Minor services are performed at shorter intervals, and major services performed at longer intervals. A major service includes the items performed at a minor service, but also includes other service items that need to be performed less frequently. At a service, lubricants can be changed, items such as spark plugs and filters replaced and adjustments and checks performed on components that wear out, such as brake pads and tires.

Time-based service
Time based services protect a vehicle from deterioration over time rather than from the amount of use, which is measured by the distance traveled. These are performed when a vehicle is not used very much and travels only a small distance over a period of time. Minor services are performed at 6-month intervals. Major services are performed every 12 months. Lubricants and fluids have a service life and should be changed even if the vehicle has covered only a few miles or kilometers since the last service. Time based services are also performed on a seasonal basis, to prepare the vehicle for the onset of summer or winter.
Non-scheduled servicing
Pre-trip check
Out of phase services are performed on a vehicle prior to a long trip and can involve a check of components as well as the replacement of drive belts, hoses, tires etc. If the vehicle is within 700 m (1000 km) of a scheduled service it is appropriate to perform all service tasks at this time. An out of phase service may also prepare the vehicle for travel into a different country or to a different climate and may include fitting driving or fog lamps, or altering the coolant mix.
Routine vehicle checks
The vehicle owner is responsible for some routine checks. The checks should be performed weekly and include:

These services require a small degree of skill and are often overlooked, resulting in minor breakdowns.
Source: CDX Global