Engine wear refers to the gradual deterioration of engine components due to friction, heat, and chemical reactions over time. This wear can affect parts such as pistons, cylinders, and bearings, leading to reduced performance and efficiency. Regular maintenance, including oil changes and inspections, can help minimize wear and extend the engine's lifespan. Factors contributing to engine wear include inadequate lubrication, poor-quality fuel, and extreme operating conditions. Engine oil plays a crucial role in reducing friction and protecting components. Monitoring engine performance and addressing issues promptly can prevent severe damage and costly repairs.