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 sludge, carbon deposits, and other contaminants that can accumulate over time, improving engine performance and longevity. After the cleaning solution has circulated for a specified period, the old oil and the cleaning agent are drained from the engine. Fresh engine oil is then added, ensuring that the engine operates smoothly and efficiently. Regular engine flushes can help maintain the health of the engine, especially in older vehicles.