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Related Clues:
- Exxon, once
- Chevron competitor
- 'The sign of extra service' sloganeer
- Canadian oil company
- Old U.S. gas brand
- Acronym formed from 'Standard Oil'
- Bygone sign on U.S. highways
- 1999 British Petroleum acquisition
- Old Phillips 66 rival
- Petrol station choice
- Exxon alternative
- Petrol seller
- Renamed oil company
- Company that merged with BP, 1998
- Gulf rival