PRI-D for diesel fuel, including low sulfur diesel (ULSD), is a boater's best protection against start-up failures, plugged fuel filters, excessive smoke and soot, and damaged engines. As the unmatched leader in marine fuel treatments, PRI-D: enhances ignition quality, dramatically cuts diesel smoke and soot, prevents damaging, power-robbing deposits in fuel systems, enhances lubricity for reduced injector pump wear, keeps fuel fresh during long layup periods, restores stale fuel to freshness, keeps fuel systems and filters clean, and provides greater power, greater efficiency and greater reliability on the water.