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3. Had smash debut "Core" (abbr.)

Alternative clues for the word stp

• Longtime sponsor of Richard Petty
• Brand of power steering fluid
• Motor treatment letters
• Daytona 500 advertiser
• Potent hallucinogen
• Popular gas additive
• "Inside every great machine" brand
• Standard temperature and pressure
• Son of a Gun! Protectant maker
• Indy sponsor