| abstract |
PURPOSE:A lubricating oil composition suitable for power transmission device having traction drive mechanism, having improved durability and high traction coefficient, comprising a specific base oil, zinc dithiophosphate, etc., and a phosphoric ester, etc. CONSTITUTION:The aimed lubricating oil composition consisting of (A) a based oil comprising a (non)condensed cyclic saturated hydrocarbon as a main component, (B) (i) a zinc dithiophosphate shown by the formula I(R<1>-R<4> are 3-30C alkyl, 6-30C aryl, etc.,) and/or (ii) an oxymolybdenum organophosphorodithionate shown by the formula II(R<5> and R<6> are 1-30C alkyl, cycloalkyl, etc.,; X and Y are real numbers to satisfy X+Y=4) and (C) (phosphorous)phosphoric ester(amino salt). |