Patent ID: 8221643

Claim:
A compression type refrigeration system having a traction mechanism within a compressor and comprising a lubricating oil composition, the lubricating oil composition comprising a base oil having a kinematic viscosity of 2 to 1,000 mm 2 /s at 40° C., said base oil comprising at least one compound selected from the group consisting of exo-2-methyl-exo-3-methyl-endo-2-[(endo-3-methylbicyclo[2.2.1]hepto-exo-2-yl)methyl]-bicyclo[2.2.1]heptane, exo-2-methyl-exo-3-methyl-endo-2-[(endo-2-methylbicyclo[2.2.1]hepto-exo-3-yl)methyl]-bicyclo[2.2.1]heptane, endo-2-methyl-exo-3-methyl-exo-2-[(exo-3-methylbicyclo[2.2.1]hepto-exo-2-yl)methyl]-bicyclo[2.2.1]heptane, endo-2-methyl-exo-3-methyl-exo-2-[(exo-2-methylbicyclo[2.2.1]hepto-exo-3-yl)methyl]-bicyclo[2.2.1]heptane, endo-2-methyl-exo-3-methyl-exo-2-[(endo-3-methylbicyclo[2.2.1]hepto-endo-2-yl)methyl]-bicyclo[2.2.1]heptane, and endo-2-methyl-exo-3-methyl-exo-2[(endo-2-methylbicyclo[2.2.1]hepto-endo-3-yl)methyl]-bicyclo[2.2.1]heptane.