With sufficient investment, it is widely believed that Iran could increase its crude Oil production capacity significantly. Iran produced 6 million bbl/d of Crude Oil in 1974, has not come close to recovering to that level since he 1978/79 Iranian revolution. Still, Iran has ambitious plans to increase national oil production - to more than 5 million bbl/d by 2010, and 8 million bbl/d by 2015. The country is counting on billions of dollars in foreign investment to accomplish this, but the goal is unlikely to be achieved without a significant change in policy to attract such investment (and possibly a change in relations with the West).
Iran exports around 2.7 million bbl/d, with major customers including Japan, China, South Korea, Taiwan, and Europe. Irans main export blends include Iranian Light (34.6° API, 1.4 percent sulphur); Iranian Heavy (31° API, 1.7 percent sulphur); Lavan Blend (34°-35° API, 1.8-2 percent sulphur); and Foroozan Blend/Sirri (29-31° API). Irans domestic oil consumption, 1.5 million bbl/d in 2005, is increasing rapidly as the economy and population grow. As mentioned above, Iran subsidizes the price of oil products heavily, resulting in a large amount of waste and inefficiency in oil consumption. 
State-owned National Iranian Oil Company (NIOC)s onshore field development work is concentrated mainly on sustaining output levels from large, aging fields. Consequently, enhanced oil recovery (EOR) programs, including Natural Gas injection, are underway at a number of fields, including Marun and Karanj. Overall, Irans oil sector is considered old and inefficient, needing thorough revamping, advanced technology, and foreign investment.