An engine flush is a process used to clean the internal components of a vehicle's engine. It involves adding a special cleaning solution to the engine oil, which circulates through the engine while it runs. This solution helps to dissolve and remove sludge, deposits, and contaminants that can accumulate over time, improving engine performance and longevity. After the flushing process, the old oil and cleaning solution are drained, and fresh oil is added. Regular engine flushing can help maintain the health of the engine, ensuring it runs smoothly and efficiently. However, it is essential to follow the manufacturer's recommendations regarding frequency and necessity.