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3. Auto. engine enhancer

Alternative clues for the word stp

• Brand of octane booster
• Eng. oil additive
• Motor oil letters
• Big initials at Indy
• Gas additive brand that sponsors a NASCAR race at a Virginia track
• Common fuel additive
• Racer's brand
• Had smash debut "Core" (abbr.)
• Name on an oval
• "Plush" band, initally