A refrigerant composition includes R125 (pentafluoroethane), R134a (1,1,1,2-tetrafluoroethane), R600a (isobutane) and a polyol ester (POE) lubricant. In one exemplary embodiment, the refrigerant includes about 53-57 wt % R125, about 40-44 wt % R134a, about 1-5 wt % R600a and no more than about 1 wt % POE. In another embodiment, the refrigerant composition includes about 54-56% R125, about 41-43 wt % R134a, about 2-4% R600a and about 0.3-0.7 wt % POE. In yet another embodiment, the refrigerant composition includes about 54.63 wt % R125, about 41.72 wt % R134a, about 2.98 wt % R600a and about 0.67 wt % POE. Manufacturing the refrigerant composition includes charging a vessel with about 53-57 wt % R125, about 44 wt % R134a, about 1-5 wt % R600a to form as 100 wt % charge, and then injecting no more than about 1 wt % POE.