Refrigerator oil, compressor oil composition, hydraulic fluid composition, metalworking fluid composition, heat treatment oil composition, lubricant composition for machine tool and lubricant composition

A fluid composition for refrigerating machine comprising:

• a refrigerating machine oil comprising a lubricating base oil having % CA of not more than 2, % CP/% CN of not less than 6, % CN of 7 to 13, a sulfur content of not more than 100 ppm by mass, and an iodine value of not more than 2.5,
• wherein the content of the saturated components in the lubricating oil base oil is not less than 95% by mass based on the total amount of the lubricating oil base oil, and wherein the ratio of MA/MB of the mass of monocyclic saturated components MA to the mass of bi- or more cyclic saturated components MB in the saturated cyclic components is not more than 3;
• and
• a refrigerant.