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Alternative clues for the word stp

• Fuel additive known as "the racer's edge"
• "Wicked Garden" rockers (Abbr.)
• NASCAR-sponsoring additive
• Name on an oval
• Big name in auto products
• Ethanol fuel system treatment brand
• NASCAR sponsor since 1971
• 1999 Clorox acquisition
• Big name at Indy
• Additive brand used in auto racing