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3. NASCAR additive

Alternative clues for the word stp

• 500 initials
• Potent hallucinogen
• Its slogan is "The Racer's Edge"
• Popular engine additive
• Scott Weiland's band, for short
• Auto engine conditioner
• Major race sponsor
• Fuel additive brand that's a major NASCAR sponsor
• 60's-70's hallucinogen
• Logo seen at the Indy 500