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3. Brand advertised on many Nascar autos

Alternative clues for the word stp

• Fuel additive brand that sponsors NASCAR
• Engine conditioner, abbr
• Popular engine additive
• Fuel additive brand that's a major NASCAR sponsor
• Racer's brand
• Auto. engine enhancer
• Name on an oval
• Additive sold at Pep Boys
• Auto performance brand
• Big advertiser at auto races