Millers Oils Engine Flush Additive is the best way to clean your engine, and prepare it for new oil. Just add the contents of the bottle to your engine, and then run the engine for 15 to 20 minutes. The engine flush will remove any debris that has built up in the engine and carry the debris to the oil filter, ready for you to dispose of and replace with a new filter. This will leave your engine debris free and clean, ready for its new oil.Each 250ml bottle will treat 4-6 litres of engine oilSuitable for all grades of engine oil, and both petrol and diesel enginesMillers Oils Diesel Product SelectorMillers Oils Petrol Product Selector