| Answer | Crossword Clue |
|---|---|
| STP | Gas treatment letters |
| STP | Oil-treatment letters |
| STP | Oil treatment letters |
| STP | Motor treatment letters |
| STP | Gas-additive letters |
| EXXON | Red gas letters |
| STP | Gas additive letters |
| HESS | Gas sign in green letters |
| ARCO | Gas brand rendered in all capital letters |
| ESSO | Gas brand that sounds like two letters |
| ESSO | Red-letters-in-a-blue-oval gas logo |
