Shamrock[]
1929–1980[]
In 1967 Shamrock Oil Merged With Diamond Alkali To Form Diamond Shamrock, The Shamrock Stations Were Renamed Diamond Shamrock In 1980
Shamrock Oil[]
2001–2004[]
In 2001 Valero Energy Corporation Bought Diamond Shamrock, And Returned The Shamrock Name After A 21 Year Absence
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2004-present[]
