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3. Additive sold at Napa Auto Parts

Alternative clues for the word stp

• Racing initials
• Big name in fuel additives
• Longtime Nascar sponsor
• "Helping Engines Run Better" sloganeer
• Big name at Indy
• "The racer's edge" brand
• Son of a Gun! Protectant maker
• Popular fuel additive brand
• Ethanol fuel system treatment brand
• Motor additive brand