IMPROVES THE MILEAGE: This oil is really good for improving the mileage as it can remove the sludges and deposits from the engine. To get the best results add it to crankcase before regular oil change.. Abro super motor flush is specifically designed to completely clean and flush an engines lubrication system of gum, sludge, and varnish that builds up on the inner walls of the oil chamber, valves and rings of your engine when changing the oil in your vehicle.