A novel experimental method was developed for measuring the methanol partitioning between water and hydrocarbon phases at 0.1-69 MPa and 0-50degreesC. The reliability of this method was established by comparing data from this method to reported data from Chen et al. (GPA RR-117, 1987). Methanol partitioning between aqueous and hydrocarbon phases was measured for a methane + n-heptane mixture and three oils from the Gulf of Mexico. The results of these measurements were compared to predictions from PVTSim(R) 13 and Multiflash(R) 3.2. The discrepancies between the predicted and measured methanol solubilities in the hydrocarbon phases had an overall average of 27% and ranged up to 78%. (C) 2004 Elsevier B.V. All rights reserved.