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3. Brand known as "the racer's edge"

Alternative clues for the word stp

• "Multipurpose Motor Treatment" brand
• Big name in gas treatments
• Auto-racer sponsor
• Octane Booster maker
• It's "inside every great machine"
• Petty cash supplier?
• AutoZone brand
• Pep Boys product
• Additive sold at AutoZone
• Common Nascar letters