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Alternative clues for the word stp

• Car care product
• Potent hallucinogen
• Maker of fuel additives
• Brand that makes Gas Treatment and Octane Booster
• Oil treatment letters
• Big Nascar advertiser
• Letters on many a racecar
• Fuel additive brand that sponsors NASCAR
• Popular oil additive
• Onetime sponsor of Richard Petty and Mario Andretti