The liquid saturated properties (solubility, density, and viscosity) data for binary system of ethane + n-octadecane at three temperatures (323, 373, and 423) K and pressures up to 8 MPa were measured using a designed pressure–volume–temperature (PVT) apparatus. The experimental data (saturated liquid phase composition and density) were compared with the modeling results obtained using the Peng–Robinson and Soave–Redlich–Kwong equations of state. Both models were capable of representing the solubility data well; however, the Peng–Robinson equation of state gave better estimation of liquid saturated densities both with and without volume translation.