Consistent vapor-liquid equilibria (VLE) at 101.3 kPa has been determined for the ternary system 3-methylpentane + diisopropyl ether (DIPE) + methylcyclohexane and the binary subsystems 3-methylpentane + methylcyclohexane and DIPE + methylcyclohexane in the temperature range from 336 to 374 K. According to the experimental results, the systems exhibit slight positive deviation from ideal behavior and no azeotrope is present. The VLE data have been correlated with the composition using the Wilson, UNIQUAC and NRTL relations. These models allow good prediction of the VLE properties of the ternary system from those of the pertinent binary subsystems.