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3. Brand in a "non-friction best seller" ad

Alternative clues for the word stp

• Sprint Cup Series sponsor
• Product at a gas station
• Brand of fuel additives
• Brand advertised on many Nascar autos
• Name in fuel additives
• Engine-cleaning brand
• Engine additive brand
• Lubricant with an oval logo
• Postage item: Abbr
• Indy 500 brand