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3. The Racer's Edge

Alternative clues for the word stp

• Longtime Richard Petty sponsor
• ''The racer's edge''
• Big advertiser at auto races
• Ultra 5-In-1 Fuel System Cleaner brand
• Brand known as "the racer's edge"
• Engine additive letters
• Additive at Indy
• Racer's sponsor
• 500 letters?
• Auto. engine enhancer