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3. NASCAR additive

Alternative clues for the word stp

• Brand on many an auto racer's jacket
• Slick 50 competitor
• The racer's edge, commercially
• Indy 500 inits.
• Brand of motor oil additive
• ___ 500, annual race in Ridgeway, Va.
• Fuel additive known as "the racer's edge"
• Brand at the Daytona 500
• 500 letters?
• Racing initials