 The Bahrain Petroleum Company refinery was built in 1935, has a capacity of about 250,000 barrels (40,000 m³) per day, and was the first in the Persian Gulf.After selling 60% of the refinery to the state-owned Bahrain National Oil Company in 1980, Caltex, a U.S. company, now owns 40%.Saudi Arabia provides most of the crude for refinery operation via pipeline.