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3. Brand of motor oil

Alternative clues for the word stp

• ___ 500, annual race in Ridgeway, Va.
• Popular oil additive
• Engine-cleaning brand
• Name in fuel additives
• Gas additive and NASCAR sponsor
• Oil treatment letters
• Racer's sponsor
• Logo seen at the Indy 500
• Gas station product
• Indy 500 inits.