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3. Motor oil additive brand

Alternative clues for the word stp

• Son of a Gun! Protectant maker
• NASCAR additive
• Fuel additive brand that sponsors many auto racing events
• Big name in gas treatments
• Havoline competitor
• Had smash debut "Core" (abbr.)
• Speedway logo
• Noted NASCAR sponsor
• Big inits. in fuel additives
• Big name in auto additives