Air filters are one of the most important parts of automobiles’ engines as they prevent harmful debris, dirt and contaminants from entering your engine, as well as preventing dust, pollen, and other pollutants from entering your car through your A/C and heat vents.

Engine Air Filter

The engine air filter is there to filter out any impurities in the air that is taken in by the engine for combustion. As a result, this helps the overall combustion process work properly, which ensures the engine is running right. Something that has direct influence on the combustion process like this also has direct influence on the fuel-efficiency of the vehicle

There is no set time to change out the air filter. But ideally, you’ll want to change it out once a year. While it does depend heavily on how clean an environment is, changing the filter out yearly is good if there is low pollution or insignificant dust levels in your area. If you drive in an area where these levels are higher, it’s important to change the air filter more frequently. The engine air filter is a direct influence on your car’s overall performance — don’t neglect it.

Cabin air filters

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Since 2001, most cars have been equipped with a cabin air filter designed to keep the air inside the car clean and free of dust, smoke and odors that may waft through even when the windows are closed. Often, a cabin filter may be hidden out of sight but is easily accessible under the dash, behind the glove box or in the air box in the engine compartment. Depending on the location, a cabin air filter can be changed in 10 minutes or so. To keep your car running better – and to give you more comfort while riding in it – keep your air filters up to date.

Oil Filter

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the oil filter is far more important to the life of your engine than the engine air filter, and has an even bigger impact on the performance of your vehicle.

Inside the engine, there are a lot of parts working together. As a result, the normal wear and tear involves little metal shavings that can build up and block the flow of components, and end up in the oil pan. When the oil is cycled back through, the metal shavings will come with it, and potentially harm the engine. Since the engine oil is there to keep the engine cool and working as effortlessly as possible, it’s important that these shavings are removed — which is the oil filter’s job.

Even though oil filters have come a long way since, it’s still important to get them changed on a regular basis. Unlike air filters, there is a general rule as to when it’s time to change an oil filter, which is every time you change your oil.

Fuel Filter

fuel filter,  is the only one on this list that has two different functions. Depending on the type of fuel used — petroleum or diesel — the fuel filter will act differently. For gasoline engines, the fuel filter is there to remove any impurities that came with the fuel you just put in your car. Since petroleum is an organic source, just like conventional engine oil, it will have some impurities in it. Don’t worry though, the impurities in both conventional oil and gasoline aren’t harmful to your engine.

For a diesel engine, the fuel filter is used in a much different way. While they both help the overall performance and life-span of the engine, the diesel engine is used to prevent corrosion on the parts inside the engine by removing any water that builds up. Since diesel is lighter than water, the filter is a bowl-like design that collects the water at the bottom. Then, a drain plug can be removed at the bottom to get rid of the water until just diesel is left. Allowing water into your engine or fuel system will cause serious problems, so it’s important to be aware of that if you drive a diesel vehicle.