Related Clues:

• Nitrogen, for instance
• Lubricant
• Balloon fill
• Swell time
• Shale extract
• Rembrandt medium
• Stove fuel
• Squeak stopper
• Gusher output
• Olive, for one
• Rip-roaring time
• Blowtorch fuel
• Bang-up time
• Station purchase
• It's often crude