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Alternative clues for the word stp

• Indy 500 brand
• Longtime sponsor of Richard Petty
• NASCAR-sponsoring additive
• Oil additive letters
• Indy additive
• Onetime sponsor of Richard Petty and Mario Andretti
• Gas additive brand that sponsors a NASCAR race at a Virginia track
• Gasoline additive brand
• Initials seen at Indy
• Gas treatment brand