Modern combustion engines need free flowing air so they can properly operate.  A free flowing air is what is being fed to the car's engine to start the combustion process.  If there are more fresh air, that means more combustion and if there is more combustion, there would be more power.  Since it tries to draw essential air in from the engine's outside part, the small particles such as dirt, oil and dust have their way to get into the car's engine.  When these contaminants are inside the engine, they can contaminate the oil in the engine and they can then act as abrasive which causes premature wear for engine and oil.

For you to prevent this from happening, you need to install air filters on modern combustion engines.  Through the tube, the air is drawn into the car's engine.  However, it should pass through the filter first before it can reach the car's engine.  The air filters are catching all the deposits and particles.  Since they accumulated over time, our air filters need regular cleaning and replacement.  That is why it is so much important that you select the most reliable filter available in the market.  The primary medium of filtration for engines is paper.  Modern cars uses rectangular-shaped filters filled with pleated layers to form meash and they resemble an anti-static dryer sheet.