Related Clues:

• Tends to a squeak
• Some are essential
• Derrick flow
• Jed's discovery
• Midnight fuel
• Rembrandt's medium
• Greases
• Some change it regularly
• Tanker cargo
• Reduces friction, in a way
• Exxon product
• Fossil fuel
• Cruet contents, often
• Met works
• Bathwater additives