This paper reports experimental phase equilibrium data for the systems {CO2(1)+ solketal(2)} and {CO2(1) + solketal(2) + oleic acid(3)}. The phase transition pressures measurements for ternary mixtures were carried out by injecting a known amount of carbon dioxide into a mixture with fixed molar ratios of the two other components [0.75 solketal + 0.25 oleic acid)]. A variable-volume cell with front window was used for obtaining experimental data. The temperature range from 308 to 338 K and pressures up to 20 MPa was obtained. Bubble point conditions were measured for the binary system {CO2(1) + solketal(2)}, whereas bubble and dew point conditions were measured for the ternary system {CO2(1) + solketal(2) + oleic acid(3)}.