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3. Engine conditioner, abbr

Alternative clues for the word stp

• Big name at Indy
• Fuel additive brand that's a major NASCAR sponsor
• Letters on Richard Petty's race car
• Automotive additive brand
• Inits. at Indy
• Indy 500 logo
• Lubricant with an oval logo
• Auto additives co. that hints at this puzzle's theme
• Son of a Gun! Protectant maker
• Indy supplement