With its leading contribution to GNP, prior position in funding the public budget, and a prominent share in the national exports, the oil sector contemporarily plays a substantial role in Saudi and Iran's economies. However, massive accumulated oil earnings, the lowest oil production costs, and a superior rank in the world's proven reserves, indicate the economic improvement potential. Accordingly, analyzing feasible improvement in these economies through amplifying the oil sector by measures that take to (1) the public budget components, (2) the oil revenues quotas, and (3) the composition of national imports and exports via a General Equilibrium procedure is the main goal of this research.Relatively upper growth potential with lower stability was revealed under more intensive linkages between Saudi Arabia's national economy and oil sector and its more in-depth mutual dependence on the global oil market (than Iran). Consequently, Saudi Arabia should suffice on slight permanent oil raises or (at the most) quite temporary, notable ones. On the contrary, persistent, (proportionally) notable oil rises are advised for Iran. Moreover, the fiscal expansions reinforce Saudi Arabia's oil-amplifying actions while making Iran's progress sluggish, especially in case of remarkable oil rises.Meanwhile, slight oil output rises could be provided by the existing spare capacities; productivity improvement, economic relationships reform, and rearranging oil revenue quotas will be required for further progress.