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3. Fuel additive brand that sponsors NASCAR

Alternative clues for the word stp

• Racing initials
• Auto maintenance letters
• Valvoline competitor
• Automotive brand with a red oval logo
• Common fuel additive
• Valvoline alternative
• Its slogan is "The Racer's Edge"
• Octane booster brand
• Oil treatment brand since 1954
• Motor oil brand that sponsors NASCAR