Good night friend has to take into account that when a maintenance service is done to a vehicle you must change filter oil, air filter, gasoline filter time strap and its tensor and its spark plugs remember that the spark plugs and oil is changed at the same time the air and gas filter you must change it monthly since the gasoline may be that it is very dirty in the tank that is transported or in the tank of the service stations From the mileage of the belt, it should not exceed 40 thousand kilometer from the quality of the belt and the oil at 5 thousand or 6 thousand kilometers I hope my help serves you