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3. Additive brand used in auto racing

Alternative clues for the word stp

• Gas treatment letters
• Initials seen at Indy
• Indy letters
• Ethanol fuel system treatment brand
• Car care product that sponsors NASCAR
• Fuel additive known as "the racer's edge"
• Postage item: Abbr
• Racing Series Octane Booster maker
• Common race-car decal