The term 'American Oil Brand' can be summarized by two crossword solutions: Esso (4 letters) and ARCO (4 letters). Esso is a brand of gasoline and motor fuel that is owned by ExxonMobil, one of the largest oil companies in the world. ARCO is a brand of gasoline and motor fuel that is owned by BP, another large oil company. Both brands are popular in the United States and are widely available at gas stations across the country.