Possible Clues:

• Crude oil, informally
• Drink made with tequila, rum, vodka, gin, bourbon, triple sec, sweet-and-sour mix and Coke
• Target for some Southern pumps
• Jed Clampett's discovery, in a sitcom theme song
• Crude, in slang
• Crude nickname
• *Oil, jocularly
• Crude oil, slangily
• Term for oil in a 1960s sitcom's theme song
• Crude oil, in slang