NOVELTY - A composition (C1) comprises 2,3,3,3-tetrafluoropropene (HFC-1234yf), pentafluoroethane (HFC-125), and at least one compound selected from n-butane, isobutane, and/or 1,1,1-trifluoroethane (HFC-143a).    USE - As heat transfer fluid composition for making azeotropic or near-azeotropic composition, for producing cooling and heat; for replacing high GWP refrigerant in a refrigeration, air-conditioning, or heat pump apparatus; as aerosol propellants; for forming foam and aerosol products; and in refrigeration, air-conditioning, and heat pump apparatus such as mobile apparatus, automobile air-conditioning apparatus, refrigerated road transport equipment, stationary air-conditioning system, stationary heat pump system, stationary refrigeration system (all claimed); as heat transfer fluids, foam blowing agents, and fire suppression and fire extinguishing agents.    ADVANTAGE - The composition improves oil-return to the compressor in a compression refrigeration, air-conditioning and heat pump apparatus; provide novel refrigerant compositions and heat transfer fluid compositions that provide unique characteristics to meet the demands of low or zero ozone depletion potential and lower global warming potential as compared to current refrigerants.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) an azeotropic or near-azeotropic composition (C2) comprising a composition comprising (wt.%): HFC-1234yf (1-19), HFC-125 (80-98), and n-butane (1-10); HFC-1234yf (1-40), HFC-125 (59-98), and isobutene (1-20); or HFC-1234yf (1-60), HFC-125 (1-98), and HFC-143a (1-98);    (2) producing cooling, involving evaporating the composition (C1) in the vicinity of a body to be cooled and condensing the composition;    (3) producing heat, involving condensing the composition (C1) in the vicinity of a body to be heated and evaporating the composition;    (4) detecting the composition (C1) in a compression refrigeration, air conditioning, or heat pump apparatus, involving providing the composition including the ultra-violet fluorescent dye to the apparatus, and providing a suitable means for detecting the composition at a leak point or in the vicinity of the apparatus;    (5) solubilizing a refrigerant or heat transfer fluid composition comprising the composition (C1) in a refrigeration lubricant containing mineral oil, alkylbenzenes, synthetic paraffins, synthetic napthenes, or poly(alpha)olefins, involving contacting the lubricant with the composition in the presence of a compatibilizer;    (6) replacing a high global warming potential (GWP) refrigerant (A1) in a refrigeration, air-conditioning, or heat pump apparatus, involving providing the composition (C1) to the refrigeration, air-conditioning, or heat pump apparatus that uses, used or is designed to use the high GWP refrigerant;    (7) a method of using the composition (C1) as a heat transfer fluid composition, involving transporting the composition from a heat source to a heat sink;    (8) making the composition (C1) involving reclaiming a volume of at least one component of a refrigerant composition from at least one refrigerant container; removing impurities to enable reuse of the reclaimed components; and optionally, combining all or part of the reclaimed volume of components with at least one additional refrigerant composition or component;    (9) a refrigeration, air-conditioning, or heat pump apparatus containing the composition (C1);    (10) forming a foam involving adding the composition (C1) o a foamable composition; and reacting the foamable composition under conditions effective to form a foam;    (11) producing aerosol products involving adding the composition (C1) to active ingredients in an aerosol container, where the composition functions as a propellant.