Related Clues:

• Van Gogh's ''Irises,'' e.g.
• Lube
• Paint base, sometimes
• 'Black gold'
• 3-IN-ONE, e.g.
• Vinaigrette ingedient
• Auto fluid
• De-squeak
• ''Lorenzo's ___'' (1992)
• __ and vinegar
• Upton Sinclair novel that inspired 'There Will Be Blood'
• ''Giant'' discovery
• Use 3-IN-ONE, e.g.
• What the Ewings and Clampetts had in common
• Museum piece, maybe