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3. Brand of motor oil additive

Alternative clues for the word stp

• Indy inits
• Racetrack letters
• Racecar fuel additive
• Longtime Richard Petty sponsor
• 500 letters?
• "The Racer's Edge" product
• Indy 500 inits.
• Prominent NASCAR sponsor
• Common fuel additive
• Brand in a "non-friction best seller" ad