Engine cleaning oil is often used to clean the lubrication system. It is a kind of car maintenance used to clean the engine's internal sludge, carbon deposits, colloids and other harmful substances, keep the engine clean, enhance the fluidity of the oil, reduce wear and extend the service life of the engine Supplies. Generally, add the cleaning oil after the old oil is drained, and run the engine for a few minutes at idle speed before putting clean cleaning oil, and then add new oil, and the remaining cleaning oil can be mixed with the new oil. The engine cleaning oil can indeed remove a part of the oil scale, and it has a certain effect on the removal of carbon deposits.