Abstract: Lubricating oil composition for use with sintered porous bearings includes a poly-.alpha.-olefin hydride or ethylene-.alpha.-olefin copolymer hydride containing base oil to which at least one additive selected from the group consisting of zinc dialkyl dithiophosphate, molybdenum dialkyl dithiocarbide, molybdenum dialkyl dithiophosphate and a sulfur-phosphorus containing extreme pressure additive is added in an amount of 0.01 to 5 parts by weight per 100 parts by weight of the base oil.

Abstract: Triurea grease compositions having excellent oil separation, shear stability, oxidation stability and structural stability of a thickening agent at a high temperature, which contains a triurea compound ##STR1## wherein R.sub.1 is a monovalent aliphatic hydrocarbon radical having 12-24 carbon atoms, R.sub.2 is a divalent triazine derivative radical, R.sub.3 is a divalent aromatic hydrocarbon radical having 6-15 carbon atoms or the derivative radical thereof, and R.sub.4 is at least one of monovalent aliphatic hydrocarbon radicals having 2-24 carbon atoms, derivative radicals thereof, monovalent aromatic hydrocarbon radicals having 6-10 carbon atoms and derivative radicals thereof, as a thickening agent in a usual lubricating base oil.