When a vehicle runs a particular distance, it is mandatory that the oil needs to be changed. If it is not changed the heat generated will be very high.
Changing Spark Plugs
Good quality spark plug is very important for proper ignition in the engine. If the spark is not functioning properly, there a considerable amount of fuel waste.
Replacing Air Filters
Air filter cleaning is must, and after a point of time, it loses its capacity and hence, it needs to be replaced if it is needed.