From a modest beginning in the mid-1930's, the lubricating oil additive technology has become a major branch of the lubricating oil technology, with reported sales of more than 75, 000 tons annually in Japan. Additives of many diverse types have been developed to meet special lubrication needs such as, ring sticking of diesel engine, low temperature sludge of gasoline engine, corrosion of marine engine, long life oil for steam turbine, hypoid gear lubrication, severe oxidation problem of high temperature units, etc.