Abstract
The author reviews the recent topics of lubricating oils, which are consider-ed important and interesting. On turbine oil, the use of additive improves its performance excellently and good quality of turbine oil can be manufactured from Kuwait crude oil by using additive; on insulating oil, Japanese Industrial Standard test on oxidation stability and results of use of regenerating oil are mainly described; on motor oil, evaluation of Heavy Duty type oil is described. Morever, he discusses the effect of extreme pressure additives and its working mecha-nism, and explains the new calculation table of Redwood viscosity to kinematic viscosity.
