It is difficult to give a specific time or mileage for when an air filter should be changed because its life depends on how much dust or dirt it ingests. A filter that lasts 30,000 km or up to 40,000 km in a vehicle that is mostly driven on streets and avenues can last only a month or two in a rural environment where it is often moved on unpaved roads. Changing it annually or every 20,000 km for preventive maintenance is a good recommendation for use in the city and for a shorter period if your job is rural.
Regardless of mileage or time, an air filter must be replaced before it reaches the point where it begins to significantly restrict airflow. But exactly when that point is reached is subject to opinion.
A slightly dirty filter actually cleans more efficiently than a new filter. This is because the debris trapped by the filter helps to retain smaller particles that it tries to pass. But eventually, each filter reaches the point where it causes a drop in pressure and restricts the flow of air. If a dirty filter is not replaced it directly affects fuel economy, performance and emissions are increased.
Many rough-duty pickups have a meter that monitors and warns by means of a signal on the board when the filter is dirty and needs to be changed. But given the lack of that device in the cars, it is best to change it according to your criteria and what we recommend before.
If you remove the filter and put it backlight you can see how dirty it is. If it has a layer of dirt, it obviously needs to be changed. Never try to shake it or blow dust or dirt is a waste of time since many particles are already stuck in the filter fibers. (Unless it is a washable cotton filter)
What happens when the air filter is not replaced in due time and prolonged use is made?
Performing the maintenance of an air filter is a very simple task since it is simply based on its replacement. Therefore, when the replacement of the air filter is extended too long and continues to circulate with a dirty air filter, it would stop performing its function properly causing a loss in the air supply of the cylinders.
At this point, circulating with the air filter in poor condition will cause you to notice an increase in fuel consumption and a reduction in engine power since the mixture would not be burning properly. In addition, it would also increase the output of polluting gases.
However, when you need to replace it, you should research the market before buying and choose the best air filters for cars . Then you will get the best result and feel comfortable.
Hassan Root, a dream lover of his future!