Related Clues:

• Crankcase contents
• Heat source
• USX product
• Certain cartel's concern
• With 4-Down, some armor
• ___ blue
• Well-supplied resource?
• Barrel contents
• Peanut product
• Shade of gray
• Kind of wool or guitar
• Black gold
• Engine lubricant
• Driller's quest
• Anointing substance