President Ahmadinejad made the remarks in an address made during the inaugural ceremony for two big oil projects in Tehran's Shahid Tondgoyan oil refinery.

President Ahmadinejad said that enemies of Iran could not tolerate the country has found access to the knowledge of producing and meeting all its demands.

President Ahmadinejad urged Iranian authorities to consider the halt of the country's crude oil exports since the issue of oil has been presently manipulated by big powers as a means to put pressure on its producers.

Arguing that nowadays, the price of oil was determined "based on political situation instead of economic conditions," the President said, "If not so, the real price of oil should have been very much higher in the market than what it is presently."

He added that the Shahid Tondgoyan oil refinery was the first refinery being fully completed by Iranian experts and an "indication of the complete nationalization of Iran's oil industry."

Iran launched several units to optimize the processing and improve the quality of Shahid Tondgouyan (Tehran) oil refinery's products in a ceremony attended by President Mahmoud Ahmadinejad.

Shahid Tondgouyan refinery's new units which started operation on Tuesday are able to improve the quality of the refinery's products like gasoline, gasoil and kerosene.

The optimization and quality improvement plan of the refinery's products includes desulphurization of gasoil, sulfur extraction and sulfur recovery.

Iran has expanded its refining capacity during the last couple of years, while its gasoline consumption has come down considerably following the implementation of the first phase of cutting energy subsidies.