Related Clues:

• Additive sold at AutoZone
• What the first Model T's could run on
• Part of the Armored AutoGroup
• Lucas Oil competitor
• Fuel additive letters
• Gas additive letters
• "The Racer's Edge" Indy sponsor
• Common Nascar letters
• "The Racer's Edge" sloganeer
• ___ 500, annual race in Ridgeway, Va
• "The Racer's Edge"
• 'The racer's edge'
• Brand of brake fluid
• Major car-racing sponsor
• Motor treatment letters