Related Clues:

• Rembrandt's medium
• Some change it regularly
• Tanker cargo
• Exxon product
• Fossil fuel
• Cruet contents, often
• Liquid gold
• It's measured in barrels
• Crude business
• Artist's medium
• Manet medium
• ... and its product
• Loosen up, maybe
• Lacking tact
• Olive or corn follower