1 NEW® MF-380 Motor Flush is specially formulated for heavy-duty cleaning of engine oil system from engine sludge, varnish & gum. Helps greasing friction parts. Prolongs life of all gasoline engines. Helps free sticking rings and valves. Cleans motor parts and, as a result, improves oil circulation. Improves sparkling and combustion and thus engine performance. Makes use of washing oils unnecessary. Contains no mineral spirits.