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3. Valvoline competitor

Alternative clues for the word stp

• Standard temperature and pressure
• Common fuel additive
• Fuel treatment brand
• Pennzoil rival
• Talladega decal letters
• Octane booster brand
• Auto fluid ltrs
• Iconic Nascar sponsor
• It's "inside every great machine"
• Onetime sponsor of Richard Petty and Mario Andretti