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3. Racer's brand

Alternative clues for the word stp

• Inits. at Indy
• Fuel additive on the NASCAR circuit
• Big name in auto additives
• Had smash debut "Core" (abbr.)
• Indy inits
• The racer's edge, commercially
• Auto-racing sponsor
• Part of the Armored AutoGroup
• 1985 Union Carbide acquisition
• Oil treatment brand