Related Clues:

• Barrel contents
• Peanut product
• Black gold
• Engine lubricant
• Driller's quest
• Use a 30-Across
• Anointing substance
• See 15-Down
• Slick makeup
• Word with can or pan
• Cooking fat
• Job that helps ease friction
• It floats on water
• Wildcatter's find
• Shy of a treaty