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Alternative clues for the word stp

• Petty cash source, once
• "Helping Engines Run Better Longer Since 1954" product
• Brand at a gas station
• Letters on Richard Petty's race car
• Clorox brand
• Frequent auto race sponsor
• Pit stop letters
• Lndy 500 advertiser
• The racer's edge, commercially
• Certain "edge"