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3. Logo on many a Richard Petty race car

Alternative clues for the word stp

• Brand of octane booster
• Indy racer sponsor
• Big Indy 500 advertiser
• Automotive additive brand
• "Multipurpose Motor Treatment" brand
• Racer's sponsor
• Ultra 5-In-1 Fuel System Cleaner brand
• Havoline competitor
• Product with the old jingle line "One little can will keep you running free"
• Big Indy inits