An oil filter is a crucial component in an engine's lubrication system. Its primary function is to remove contaminants and impurities from the engine oil, ensuring that the oil remains clean and effective. This helps to prolong the life of the engine and maintain its performance. Oil filters come in various types, including mechanical filters and magnetic filters, each designed to capture different types of particles. Regularly changing the oil filter is essential for optimal engine health, as a clogged filter can restrict oil flow and lead to engine damage.