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Alternative clues for the word stp

• Auto maintenance letters
• Auto additive letters
• Petty cash source?
• Armored AutoGroup brand
• "The racer's edge" brand
• "Wicked Garden" rockers (Abbr.)
• Brand that makes Gas Treatment and Octane Booster
• Auto engine conditioner
• "Inside every great machine" brand
• Longtime sponsor of racing's #43 car