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3. Brand that makes Gas Treatment and Octane Booster

Alternative clues for the word stp

• Pit crew's canful
• Oil-treatment letters
• "Helping Engines Run Better Longer Since 1954" product
• Slick 50 competitor
• Indy 500 inits
• Big name in gas treatments
• Fuel additive brand that's a major NASCAR sponsor
• Motor oil additive brand
• 500 initials
• Gas station product