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3. Fuel additive brand that sponsors many auto racing events

Alternative clues for the word stp

• Motor Up alternative
• Auto additives co. that hints at this puzzle's theme
• Son of a Gun! vinyl protectant maker
• Daytona 500 advertiser
• Racing initials
• Oil additive letters
• Auto-racer sponsor
• Oil treatment inits.
• Brand sold at Pep Boys
• Racing Series Octane Booster maker