Cuo engine oil is the brand of Mobil Oil Company, 1999 Mobil Oil and Exxon Oil. It merged with ExxonMobil and became the largest oil company in the world. Headquartered in Texas, USA, its business scope covers natural gas exploitation, oil refining and engine oil. From June 5438 to 2020 10, the list of the top 500 most valuable brands in the world was released in 2020, and Mobil ranked 406th.