Oil additive: Chemical substances added to the lubricating oil either to reinforce some of its natural properties or to provide it with certain new properties which it does not possess originally. Related posts: Personnel Management Operative Functions Administrative Role of PM Competency HR Management Role Change Personnel Policies Personnel Procedures Appealed Policies Implied Policies Specific Policies Personnel records Research Pure research Personnel research Attitude or Opinion Survey Turnover Secondary research Applied research Personnel audit Read more articles Previous PostOctane number Next PostOil galleries