An oil containing an oil mist suppressant is provided herein. The oil can be a fiber treatment oil, spinning oil, or textile treatment oil. The oil mist suppressant suppresses the formation of oil mist from the oil during treatment using the oil. In general, the oil mist suppressant will not inhibit the purpose and effects of the oil treatment. A method of reducing oil mist using the oil mist suppressant is also provided herein. The oil mist suppressant is constituted by a silicone fluid composition. The silicone fluid composition is homogeneously miscible with a dimethylpolysiloxane oil having a kinematic viscosity of 10.0 mm2/s at 25° C. The silicone fluid composition also has the property of increasing the maximum lamellar length of the dimethylpolysiloxane oil by at least 5% when 1.0% by mass of the silicone fluid composition is added thereto.