An oil filter is a device made for engines that are lubricated by oil. It functions to remove any contaminants from the oil that may have accumulated over time. When oil circulates through an engine, it picks up dirt and other external particles. If these contaminants are not removed, they can cause damage to the engine over time. As a result, an oil filter helps to maintain engine health and prolong the life of the engine by ensuring that the oil is free of debris. Oil filters are typically made out of pleated paper or other synthetic materials that work to trap dirt and other contaminants.

There are various types of oil filters available for different vehicles and engines. Some oil filters are designed to be disposable, while others can be cleaned and reused multiple times. The effectiveness of an oil filter depends on its filtering capacity, which is measured in microns. The smaller the micron rating, the more efficient the filter. When selecting an oil filter, it is important to choose one that is compatible with your vehicle and engine. Maintaining your oil filter is crucial to maintaining your engine's health. It is recommended that an oil filter be changed every 3,000 to 5,000 miles or every three to six months, depending on your driving habits.