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3. Big engine additive

Alternative clues for the word stp

• Pit stop stuff
• Big name in auto additives
• Crankcase additive
• 1985 Union Carbide acquisition
• Postage item: Abbr
• Auto additive letters
• Gas Booster brand
• Its early cans were labeled "Today's Modern Oil Treatment"
• AutoZone purchase
• Popular engine additive