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3. Automotive additive brand

Alternative clues for the word stp

• Logo on some NASCAR autos
• ''The racer's edge''
• Ethanol fuel system treatment brand
• Son of a Gun! Protectant maker
• Additive at Indy
• Motor treatment letters
• Big Nascar advertiser
• P.O. item
• Speedway logo
• Big initials at Indy