Patent ID: 9120992
Filing Date: 2015-09-01
Classification: C10M,C10N

Abstract:
1. A gear oil composition comprising: a base oil comprising a blend of (A) a mineral lubricating base oil having a 100° C. kinematic viscosity of 2 to 6 mm (D) zinc dialkyldithiophosphate in an amount of 0.02 to 0.5 percent by mass on the zinc amount basis; and (E) an alkaline earth metal detergent having a base number of 100 mgKOH/g or greater and a metal ratio of 2.5 or larger in an amount of 0.1 to 0.5 percent by mass on the metal amount basis, on the gear oil composition mass basis, wherein (C) the ester-based base oil is an ester of a monohydric fatty acid having 12 to 18 carbon atoms and a polyhydric aliphatic alcohol.