Kilometers is not everything
Although the performance of some types of maintenance is usually dependent on mileage, in many cases time is of the essence, as well as other factors. And you must remember this so as not to get into trouble.
An example would be a periodic review. The moment when this should be done is determined by the manufacturer both the mileage and 
sometimes. The corresponding entries are in the service book, where you can, for example, read that periodic maintenance is carried out every 15 km or once a year (i.e. every 000 months). Such a statement means that a review must be performed when either of these two conditions is met. If someone has driven only 12 kilometers in a year, then after 5000 months he will still have to do a check. Those who drive 12 kilometers in a month will have to undergo an inspection after three months. In the case of new vehicles, failure to follow the manufacturer's periodic checks can void the warranty, and this can sometimes be very costly.
Another, even more dramatic example of ignoring the manufacturer's requirements is the periodic replacement of the timing belt. Recommendations in this regard, concerning only a few cars produced in the last ten or so years, in addition to mileage, also determine the durability of the timing belt. Usually it is five to ten years. Sometimes the mileage limit is reduced by about a quarter due to severe operating conditions. As with periodic inspections, the belt must be replaced when one of the following conditions is met.
Ignorance of the rules for replacing a timing belt and relying solely on mileage can take a harsh revenge. Only in the case of the so-called For collision-free engines, a broken timing belt does not cause damage. In other motors, there is often nothing to repair.
It is necessary to know the manufacturer's requirements for various maintenance activities and strictly follow them, and if you are not sure that something has been done, it is better to do it again and do it well than to hope that everything will be fine.
