润滑油老化 meaning in English

aging of lubricating oil
oil ageing

Lubricating oils - determination of aging characteristics - conradson carbon residus method
润滑油老化特性测定法
Testing of lubricants ; determination of ageing characteristics of lubricating oils ; increase in conradson carbon residue after ageing by passing air through the lubricating oil
润滑剂的检验.润滑油老化性能的测定.在润滑油中通入