LUBRICATING COMPOSITIONS WITH IMPROVED THERMAL STABILITY AND LIMITED SLIP PERFORMANCE

摘要

This invention relates to a lubricating composition comprising a blend of a major amount of an oil of lubricating viscosity, gear or transmission oil package and a top treatment which comprises at least one saturated fatty phosphate ester or salt, wherein the lubricating composition is free of saturated fatty phosphites. In another embodiment, the invention relates to a lubricating composition comprising a major amount of an oil of lubricating viscosity, at least one saturated fatty phosphate ester or salt, at least on e polysulfide and at least one phosphorus antiwear or extreme pressure agent, wherein the lubricating composition is free of saturated fatty phosphites. T he invention relates to additive combinations which when added to a lubricant c an provide and improve frictional and, optionally, thermal stability properties . The additives include a phosphate ester or salt wherein the hydrocarbyl grou p of the phosphate is a fatty-saturated group. The top treatment may also include a substituted fatty imidazoline or reaction product of a fatty carboxylic acid and polyalkylene polyamine and/or a borated dispersant.