Related Clues:

• Cruet filler
• Drilling target
• Loosen, in a way
• Painter's medium
• Grease job
• Crankcase contents
• Heat source
• Certain cartel's concern
• Well-supplied resource?
• Barrel contents
• Peanut product
• Black gold
• Engine lubricant
• Driller's quest
• Use a 30-Across