Power Research, Inc. PRI-D Complete Diesel Treatment Based on the industrial-strength formula used to treat bunker fuel for the world's great cruise and merchant ships, PRI-D Complete Diesel Treatment actually makes diesel fuel burn more completely and efficiently, releasing more energy value. The result? Diesel smoke is cut by as much as 50 percent. Transoms remain virtually soot-free and are much easier to clean. Since abrasive hard carbon is not permitted to form on pistons, valves and turbochargers, your engine runs better and lasts much longer. PRI-D contains dispersants that dissolve sludge and algae slime, keeping your fuel tanks problem-free while saving on filters. Also a powerful fuel stabilizer that will not only keep new fuel fresh, but will restore older fuel to refinery specification. Join the ranks of professional mariners everywhere and experience greater power, peak performance and safety at sea with super concentrated PRI-D. One ounce treats 16 gallons.