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3. Fuel additive on the NASCAR circuit

Alternative clues for the word stp

• Indy inits
• NASCAR sponsor since 1971
• Car care brand in an oval logo
• Auto oil additive
• Auto-racing sponsor
• Condescend
• Fuel additive known as "the racer's edge"
• Engine oil additive
• ___ Gas Booster 500 (2013 race won by Jimmie Johnson)
• Auto performance brand