
1) US brand retired in 1972 2) US gas brand of yore 3) US gas brand retired in 1972 4) US oil co, outside the US 5) Acronymous gas brand 6) Acronymous gas company 7) An oil tanker label 8) Another name for Exxon 9) Australian gas brand 10) Automotive fuel retailer 11) Big brand of petrol 12) Big name in Canadian gas
Found on
https://www.crosswordclues.com/clue/esso

Esso oʊ is an international trade name for ExxonMobil and its related companies. The name is a phonetic version of the initials of the pre-1911 Standard Oil (SO = Esso), and as such became the focus of much litigation and regulatory restriction in the United States. In 1972 it was largely replaced in the U.S. by the Exxon brand after it bought Hu...
Found on
http://en.wikipedia.org/wiki/Esso

any of several foreign affiliates of the Exxon Corporation (q.v.).[1 related articles]
Found on
http://www.britannica.com/eb/a-z/e/46

European Society of Surgical Oncology
Found on
http://www.encyclo.co.uk/local/20895
No exact match found.