| abstract |
(57) [Summary] [Structure] Calcium sulfate containing water, which has at least one amino group and a hydroxyl group in the molecule, and the hydroxyl group is present on the carbon atom at the β-position from the nitrogen atom, is used as an oil. A diesel engine lubricating oil additive comprising one or more amino alcohols having a medium-dispersing function, and a diesel engine lubricating oil composition to which the diesel engine lubricating oil additive is added. [Effect] The lubricating oil additive for diesel engines of the present invention dramatically improves the cleanliness of the lubricating oil, and the amount of the metallic detergent added can be reduced thereby, and the life of the lubricating oil can be reduced. It can be extended. |