| abstract |
(57) [Problem] To provide a grease composition having excellent heat resistance and low temperature properties and a long lubrication life. SOLUTION: This is a synthetic ester oil obtained from a tri- to tetra-valent polyhydric alcohol and a carboxylic acid, and has a pour point of -40 ° C. Hereinafter, a grease composition containing a synthetic ester oil having a kinematic viscosity at 40 ° C. of 10 to 100 mm 2 / sec and a viscosity index of 135 or more as a base oil. |