Motor oil is a lubricant used in internal combustion engines to reduce friction between moving parts. It helps to keep the engine running smoothly by minimizing wear and tear, preventing overheating, and cleaning engine components. Motor oil comes in various grades and types, including conventional, synthetic, and blended oils, each designed for specific engine requirements. In addition to lubrication, motor oil also plays a crucial role in sealing gaps between engine parts and protecting against corrosion. Regularly changing motor oil is essential for maintaining engine performance and longevity, as old oil can become contaminated and lose its effectiveness over time.