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3. Engine additive since 1954

Alternative clues for the word stp

• Brand at the Daytona 500
• Oil additive since 1954
• Longtime Richard Petty sponsor
• Fuel additive brand that sponsors many auto racing events
• NASCAR-sponsoring additive
• Fuel treatment brand
• Big engine additive
• Auto fluid ltrs
• Indy initials
• Petty cash source?