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3. Rival of Havoline

Alternative clues for the word stp

• Auto additive with a red oval logo
• Scott Weiland's band, for short
• Auto additives co. that hints at this puzzle's theme
• Octane booster brand
• Motor additive brand
• Longtime Indy sponsor
• Lucas Oil competitor
• Octane Booster maker
• Indy 500 advertiser
• Engine-cleaning brand