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3. Additive sold at AutoZone

Alternative clues for the word stp

• Auto performance brand
• Indy 500 advertiser
• Part of the Armored AutoGroup
• Initials on a Nascar car
• Racetrack letters
• Oil additive since 1954
• Brand for a gearhead
• Brand of motor oil additive
• Gas station product
• Letters at Indy