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3. Longtime sponsor of Richard Petty

Alternative clues for the word stp

• Big Indy 500 advertiser
• "Multipurpose Motor Treatment" brand
• NASCAR advertiser
• Indy supplement
• Engine additive letters
• "Helping Engines Run Better Longer Since 1954" product
• Brand sold at Pep Boys
• "The Racer's Edge" sloganeer
• Indy 500 letters
• Prominent NASCAR sponsor