| abstract |
The present invention provides a lubricating oil composition exhibiting more excellent flame retardancy and biodegradability. n The biodegradable lubricating oil composition of the invention has flame retardancy and contains (1) a base oil containing a plant-derived oil in an amount of 60 mass % or more, and a polyol ester in an amount of 40 mass % or less, and (2) a polymethacrylate having a mass average molecular weight of 20,000 to 300,000 in an amount of 0.1 to 5 mass %. |