Lubricant composition

A lubricant oil composition, comprising:

• mineral oil;
• 3 to 7% by mass, based on the total mass of the lubricant oil composition, of a boron derivative of polybutenylsuccinic acid monoamide;
• and
• at least one selected from the group consisting of component (A) and component (D),
• wherein component (A) is 0.1 to 2.0% by mass, based on the total mass of the lubricant oil composition, of a sulfur-comprising compound of formula (I):
• R1—Y—(CH2)n—Sx1—(CH2)n—Y—R2 (I),
• wherein:
• R1 and R2 are each independently i) a hydrogen atom;
• ii) a C1-C50 hydrocarbon group selected from an alkyl group, a cycloalkyl group, an alkenyl group, a cycloalkenyl group, and an aryl group, or iii) a C1-C50 hetero atom-comprising group comprising an atom selected from an oxygen atom, a nitrogen atom, and a sulfur atom, which is contained in a hydrocarbon group selected from the group consisting of an alkyl group, a cycloalkyl group, an alkenyl group, a cycloalkenyl group, and an aryl group;
• each Y is independently a divalent group selected from —O—, —S—, —SO—, —SO2—, —(C═O)O—, —(C═O)NH—, —O(C═O)NH—, —C(═O)—, —N(H)—, —NHCONH—, —N═N—, —NH—C(═NH)—NH— and —S—C(═O)—;
• X1 is an integer of 1 to 3;
• and
• each n is independently an integer of 1 to 5;
• and
• wherein component (D) is 0.1 to 10% by mass, based on the total mass of the lubricant oil composition, of 2,5-(bis(n-octyldithio)-1,3,4-thiadiazole.