Related Clues:

• Crude
• It may be struck
• Heating fuel
• 'The Racer's Edge'
• Olive ___
• Nascar sponsor
• See 50-Across
• Indy 500 letters
• Salad dressing ingredient
• Cooking staple
• Deep-frying need
• Popular oil additive
• Lubricate
• Tanker's cargo
• Van Gogh's 'Irises,' e.g.