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The effect of methyl, ethyl glycol and glycerol esters of rapeseed oil fatty acids (so-called CHO additives) on the lubricating properties of the SN-400 mineral base oil containing particular antiwear additives was studied. Three commercial antiwear packages based on zinc dialkyldithiophosphorane. S-P-containing organic compounds and sulphurized esters of fatty acids were used in the study. The content of the additives in the studied oil was 3 % by mass. The tribological tests were carried out with the use of four-ball extreme-pressure tester employing a method with continuously increasing load. Lubricating properties of the tested compositions were determined by scuffing load, limiting pressure of seizure and limiting load of wear. The methyl ester of rapeseed oil fatty acid showed the highest antiwear activity, while the glycerol ester the lowest one. The methyl ester additionally showed a synergism in antiwear action with all investigated antiwear additives. The esters studied did not effect the antiseizure properties of oil compositions.