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3. Gas-tank additive

Alternative clues for the word stp

• Motor treatment letters
• Indy additive
• Longtime Nascar sponsor
• Longtime sponsor of racing's #43 car
• "The racer's edge" brand
• Big car racer sponsor
• ___ 500, annual race in Ridgeway, Va.
• DeLeo brothers band (Abbr.)
• Pit stop can
• Car care product