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3. Auto additive with a mostly red oval logo

Alternative clues for the word stp

• Son of a Gun! Protectant manufacturer
• 'The Racer's Edge'
• Slick 50 competitor
• Reunited Scott Weiland band, briefly
• Motor oil product
• Letters on Richard Petty's race car
• Additive that sponsors NASCAR racers
• Its slogan is "The Racer's Edge"
• Octane Booster maker
• Brand of motor oil additive