Mutual solubility (coexistence) curve, density, and dynamic viscosity data have been measured for the binary liquid system Fluorinert FC-72 + 1 cSt silicone oil. Liquid liquid equilibrium (LLE) data have been obtained by the cloud-point technique with the use of the shadowgraph observation. The measurements of the dynamic viscosity and density of the mixtures have revealed a change in the slope in the temperature dependence at a temperature which corresponds to LLE. The solubility curve from density measurements is in excellent agreement with that estimated by the cloud-point technique. The experimental data along the binodal curve have been analyzed by the extended scaling theory using the mass fraction as the order parameter. The scaling expression for the diameter and width of the coexistence curve is consistent with the experimental data for t < 0.1, where t is the reduced temperature.