The engine air filter is small but has the important task of keeping the engine clean and free of debris and contaminants. The air filter is a part found on any car, independent of the brand, make, and year. While all vehicles are equipped with an air filter for the engine, there is quite a bit of variety among air filters. Some filters are made with synthetic fibers. Others are made of cotton, which is equally adept at trapping and eliminating contaminants. Others still are created from paper. Just like cars themselves, air filters vary widely in their design and how long they last. But when an air filter starts to get clogged, you'll likely notice some issues in your vehicle. It's important to have the air filter checked regularly and replaced if necessary, as significant engine and mechanical problems can result if contaminated air gets into the engine.