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3. Product at a gas station

Alternative clues for the word stp

• Lucas Oil competitor
• Maker of Son of a Gun! Protectant
• Big name at Indy
• It's "inside every great machine"
• ___ Gas Booster 500 (2013 race won by Jimmie Johnson)
• Motor oil product
• Major NASCAR sponsor
• Oil treatment brand since 1954
• Letters at Indy
• Onetime sponsor of Richard Petty and Mario Andretti