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3. Auto additives co. that hints at this puzzle's theme

Alternative clues for the word stp

• Common Nascar letters
• Indy sponsor
• 500 initials
• Major race sponsor
• Gas-tank additive
• Additive that sponsors NASCAR racers
• ___ 500, annual race in Ridgeway, Va.
• Motor oil additive brand
• Racing initials
• Engine-cleaning brand