Results are given for a study on the optimization of the composition of crude oil consisting of petroleum, fuel oil, and gas condensate to improve atmospheric distillation at an installation of the Gazprom Neftekhim Salavat Atmospheric and Vacuum Distillation Company. The results of a determination of the size of dispersed phase particles and the stability factor were used to predict the effect of the gas condensate in the crude oil on the major physicochemical properties and yield of light petroleum products. An active state of the dispersed system in the mixed crude oil was found at 40 wt.%. Atmospheric distillation of the activated crude oil permits an increase in the yield of light petroleum products by 28 wt. %.