A process and apparatus for producing hydrocarbon oil from the thermal decomposition of waste plastics in a continuous process which comprises melting of a waste plastic feedstock into an auger assisted melt reactor to remove chlorine and organics contained in the waste plastic, and transferring the melted waste plastic into an heated screw pyrolysis reactor which includes a transitional metal heat transfer medium. The hydrocarbon gas from the pyrolysis reactor is fed into a vessel containing metal trays for a second decomposition which is connected with an alkali treatment 2-step process gas reactor to remove acidic gases, and any inorganic solids. The hydrocarbon gases are separated by three separate condensers. The hydrocarbon fraction of the first condenser is recycled back into the pyrolysis reaction for further thermal treatment, and the hydrocarbon fractions are collected in the remaining condensers.