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Alternative clues for the word stp

• Pit stop letters
• Major race sponsor
• "The racer's edge" brand
• Auto-additive initials
• Logo seen at the Indy 500
• Its early cans were labeled "Today's Modern Oil Treatment"
• Big inits. at Indy
• Racing letters
• "Helping Engines Run Better Longer Since 1954" product
• Letters on many Nascar cars