This engine flush additive is designed to help clean the inside of your engine before an oil change. Over time, old oil can leave behind sludge and deposits that reduce performance. This formula helps dissolve buildup and carry it out when the old oil is drained. It is added to used engine oil before changing it. Let the engine idle for the recommended time, then drain the oil and replace it with fresh oil and a new filter. The cleaning process supports better oil flow and smoother engine operation. Suitable for gasoline and diesel engines. Compatible with most standard and synthetic motor oils when used as directed.