Sunoco's main rivals in the oil industry are AMOCO, Mobil, and ARCO. AMOCO is a major American oil company that was founded in 1889 and acquired by BP in 1998. Mobil is an American oil and gas company that was founded in 1911 and merged with Exxon in 1999. ARCO is an American oil and gas company that was founded in 1966 and acquired by Tesoro Corporation in 2013. All three of these companies have been major competitors to Sunoco in the oil industry.