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Alternative clues for the word stp

• Valvoline alternative
• "Helping Engines Run Better" sloganeer
• Indy additive
• Additive sold at Pep Boys
• Lubricant with an oval logo
• Gas additive brand that sponsors a NASCAR race at a Virginia track
• Motor Up alternative
• Maker of Son of a Gun! Protectant
• 500 letters
• Big race sponsor