Formed from the merger of British Petroleum and Amoco, BP Amoco is the world's #3 integrated oil company (Exxon Mobil is #1). It has grown further by buying Atlantic Richfield Company (ARCO). The new BP Amoco has proved reserves of 19.3 billion barrels of oil equivalent, including large holdings in Alaska and the North Sea. BP Amoco operates 29,000 gas stations worldwide. It is the largest US oil and gas producer. Also a top refiner (3.2 million barrels of oil per day capacity) and petrochemicals and specialty chemicals manufacturer, it has expanded by buying motor-oil maker Burmah Castrol.