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3. Havoline competitor

Alternative clues for the word stp

• 500 initials
• Car care product that sponsors NASCAR
• Gas additive letters
• Oil additive brand
• Additive sold at Napa Auto Parts
• Oil-treatment letters
• Automotive brand with a red oval logo
• Scott Weiland "Purple" band (abbr.)
• Big advertiser at auto races
• Potent hallucinogen