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3. Son of a Gun! Protectant maker

Alternative clues for the word stp

• Crankcase additive
• Brand in a "non-friction best seller" ad
• Brand at a garage
• Richard Petty sponsor
• Popular oil additive
• Sponsor of some NASCAR drivers
• Post-off. item
• Auto additives co. that hints at this puzzle's theme
• 500 initials
• Common fuel additive