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3. Had smash debut "Core" (abbr.)

Alternative clues for the word stp

• Oil additive brand
• Logo on many a Richard Petty race car
• It's "inside every great machine"
• Fuel and oil additive brand that's a major NASCAR sponsor
• Oil-treatment letters
• Brand at a garage
• Fuel additive known as "the racer's edge"
• Major race sponsor
• Indy 500 initialism
• Eng. oil additive