Fluid-liquid (FL) and fluid-solid (FS) phase transitions are measured and correlated with two SAFT equations of state for poly(ethylene-co-octene-1) solutions in sub- and supercritical propane. The polymer concentration is found to have a weak effect on both FL and FS transitions in the range of this study (0.01-0.1 polymer weight fraction). Increasing molecular weight is found to increase the FL pressure and FS temperature, whereas increasing branch density is found to decrease the FL pressure and FS temperature.