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3. Auto additive with a red oval logo

Alternative clues for the word stp

• Brand of engine additive
• Motor oil additive brand
• Motor oil brand that sponsors NASCAR drivers
• "Inside every great machine" brand
• Indy 500 sponsor
• Big Nascar sponsor
• Additive sold at Napa Auto Parts
• ''The racer's edge''
• Gas Booster brand
• Crankcase additive