Related Clues:
- Shell alternative
- 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
- Old Phillips 66 rival
- Petrol station choice
- Petrol seller
- Renamed oil company
- Old name in oil
- Old station identification
- Bygone brand on U.S. highways