In the United States, many 7-Eleven locations used to have filling stations with gasoline distributed by Citgo, which in 1983 was purchased by Southland Corporation (50% of Citgo was subsequently sold in 1986 to Petróleos de Venezuela, S.A., with the remaining 50% acquired in 1990). Although Citgo was the predominant partner of 7-Eleven, other oil companies are also co-branded with 7-Eleven, including Fina, Exxon, Gulf, Marathon, BP, Shell, Chevron (some former TETCO convenience stores were co-branded with Chevron, and Texaco prior to the 7-Eleven purchase in late 2012), and Pennzoil. Alon USA is the largest 7-Eleven licensee in North America.