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3. Fuel additive brand that sponsors many auto racing events

Alternative clues for the word stp

• Longtime Indy sponsor
• Scott Weiland's band, briefly
• Engine additive brand
• Indy 500 sponsor
• Additive that sponsors NASCAR racers
• Petty cash source, once
• "Plush" rock band, initially
• Brand of motor oil
• Armored AutoGroup brand
• Brand known as "the racer's edge"