Before replacing your vehicle’s engine air filter, it’s important to understand that most vehicles have two air filters:an outer air filter and an inner air filter. (Some big trucks maybe own 3 filters to protect engine from dusting).
The outer filter ensures that passengers have clean air to breathe. It’s filtration efficiency is about 99%, the air permeability is about 240-320 mu per sq.m. This is especially important for city dwellers or anyone who lives in an area with poor air quality. The inner air filter, on the other hand, keeps the air your engine “breathes” clean and free of dirt, dust, and other particles — all of which can affect how efficiently your car runs. A dirty air filter can result in ignition problems and lower gas mileage. The air permeability of inner filter paper is about 7 mu per sq.m.
Like vehicle air filters should also be changed regularly as part of your vehicle’s routine maintenance. Most manufacturers recommend scheduled intervals between 15,000 to as high as 30,000 miles. If your vehicle works in harsh environment, such as deserts and comstruction sites, you should replace the filter no more than 10,000 kilometers.
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