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Alternative clues for the word stp

• Initials on some Indy cars
• Onetime sponsor of Richard Petty and Mario Andretti
• Maker of Son of a Gun! Protectant
• Iconic Nascar sponsor
• Eng. oil additive
• "Wicked Garden" rockers (Abbr.)
• Longtime auto racing sponsor
• Racetrack logo
• Engine additive since 1954
• Auto engine additive