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3. Big name in fuel additives

Alternative clues for the word stp

• Clorox brand
• Auto-racer sponsor
• Gas additive brand that sponsors a NASCAR race at a Virginia track
• 500 initials
• "The Racer's Edge" sloganeer
• Potent hallucinogen
• Fuel additive on the NASCAR circuit
• Scott Weiland band, for short
• Engine oil additive
• Petty cash source, once