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An experimental apparatus was constructed to obtain vapor-liquid equilibrium data for CO2/oil mixtures using mass analysis method with sample cylinder. Lubricants employed were POE(poly-ol ester) and PAG(poly alkylene glycol). The phase equilibria of CO2/ oil mixtures prevailed in an equilibrium cell were observed through a couple of sight glasses at the opposite ends. Data were obtained over the temperatures 10℃, 5℃, 0℃, 5℃, 10℃, 25℃, 40℃, 60℃, and 80℃ under pressures up to 14MPa and then mole fractions were calculated, respectively. In general, more solubility of CO2 is observed in POE than in PAG. Miscibility gap is closed for CO2/POE mixture but not for CO2/PAG.