| Text | Length |
| Oil company facility | 20 |
| Oil company acronym | 19 |
| Oil company acquired by BP | 26 |
| Oil Company | 11 |
| Oil companies | 13 |
| Oil city on the Caspian | 23 |
| Oil city of west Texas | 22 |
| Oil city of Iran | 16 |
| Oil city | 8 |
| Oil change unit | 15 |
| Oil change go-with | 18 |
| Oil change chain | 16 |
| Oil change | 10 |
| Oil center in Okla. | 19 |
| Oil center in Iran | 18 |
| Oil center | 10 |
| Oil centeer | 11 |
| Oil cartel, for short | 21 |
| Oil cartel's letters | 24 |
| Oil cartel's inits. | 23 |
| Oil cartel's initials | 25 |
| Oil cartel since 1960 | 21 |
| Oil cartel letters | 18 |
| Oil cartel initials | 19 |
| Oil cartel based in Vienna | 26 |
| Oil cartel acronym | 18 |
| Oil cartel for short | 21 |
| Oil cartel briefly | 19 |
| Oil cartel | 10 |
| Oil carrier | 11 |
| Oil capital | 11 |
| Oil can, maybe | 14 |
| Oil Can ___ ('80s Red Sox pitcher) | 38 |
| Oil can letters | 15 |
| Oil can abbr. | 13 |
| Oil by the barrel | 17 |
| Oil buys | 8 |
| Oil burners | 11 |
| Oil burner | 10 |
| Oil bloc | 8 |
| Oil blaze battler Red | 21 |
| Oil billionaire | 15 |
| Oil bigwig? | 11 |
| Oil baskets | 11 |
| Oil bases | 9 |
| Oil barrels | 11 |
| Oil barrel | 10 |
| Oil baron, often | 16 |
| Oil baron J. Paul | 17 |
| Oil assessor? | 13 |
| Oil apparatuses | 15 |
| Oil apparatus | 13 |
| Oil and ___ | 11 |
| Oil and water, e.g. | 19 |
| Oil and vinegar, maybe | 22 |
| Oil and vinegar holders | 23 |
| Oil and vinegar holder | 22 |
| Oil and vinegar concoction | 26 |
| Oil and vinegar alternative | 27 |
| Oil and gasoline giant | 22 |
| Oil and gas, for two | 20 |
| Oil and gas company | 19 |
| Oil and coal | 12 |
| Oil amts. | 9 |
| Oil amounts | 11 |
| Oil alternative | 15 |
| Oil alcohol | 11 |
| Oil additive since 1954 | 23 |
| Oil additive | 12 |
| Oil acronym | 11 |
| Oil a portion of veal? | 22 |
| Oil / Insurance companies merge? | 32 |
| Oil | 3 |
| Ohs, in Germany | 15 |
| Ohs' partners | 17 |
| Ohs in Ems | 11 |
| Oho, puzzlers! | 14 |
| Ohne, across the Rhine | 22 |
| Ohms x amperes | 14 |
| Ohms times amperes | 18 |
| Ohmage symbol | 13 |
| Ohm's symbol | 16 |
| Ohm's antithesis | 20 |
| Ohm or Solti | 12 |
| Ohm or joule, e.g. | 18 |
| Ohm or ampere | 13 |
| Ohm of Ohm's law | 20 |
| Ohiowa | 6 |
| Ohioans | 7 |
| Ohio/Ontario separator | 22 |
| Ohio-Ontario separator | 22 |
| Ohio-Ontario divider | 20 |
| Ohio-Indiana river | 18 |
| Ohio-born humorist Bombeck | 26 |
| Ohio-born acquirer of well over 1,000 patents | 45 |
| Ohio-based faucet maker | 23 |
| Ohio, to René | 16 |
| Ohio, for one | 13 |
| Ohio, e.g.: Abbr. | 17 |
| Ohio, e.g. | 10 |
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