Motor oil cleansing additive. The product for flushing the oil systems of gasoline and diesel engines as well as rotary engines. It efficiently removes dirt and deposits from the engine, dissolves them to the micro-particles, converts in suspended condition and drains together with the old oil. It ensures excellent lubrication of the surfaces during cleaning. Gulf Sludge Out is added into the warmed-up motor oil before each oil change. It is used to remove deposits, lacquers and other combustion products from such places as hydraulic valve lifters and grooves of the piston rings, to improve the fresh oil after change, in case of engine or oil contamination.