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3. Oil additive since 1954

Alternative clues for the word stp

• Major NASCAR sponsor
• 500 letters?
• Richard Petty sponsor
• Indy 500 sponsor
• Big initials at Indy
• Its early cans were labeled "Today's Modern Oil Treatment"
• Talladega decal letters
• Longtime Nascar sponsor
• Additive sold at Pep Boys
• "Wicked Garden" rockers (Abbr.)