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$99.99 improve engine performance. Save fuel. Compare and save! Fuel system service using Valvoline™ professional series products: helps restore power and performance by using advanced detergents to thoroughly clean the system. Removes deposits, grease, dirt and sludge. Enhance fuel mileage. This service can be performed on both gasoline and diesel engines. Deposits in your feel system can cause blockages that lead to lost acceleration, rough idling, hesitation and poor fuel mileage. Some restrictions apply. See manager for details. Expires 8/31/26.