Experimental data are presented for equilibrium vapor and liquid densities and interfacial tensions (IFT＇s) for two multicomponent mixtures. Data are presented at 120 and 150 degrees F for a CO2/synthetic-oil (containing the n-paraffins, methane to tetradecane) and at 130 degrees F for a CO2/recombined-reservoir-oil system. In both systems, measurements include the near-critical region, where IFT＇s become very low. These data should be useful in developing and testing models to predict phase behavior and IFT＇s for CO2 EOR operations.