Dura Lube 32 Ounce HL-DLOS-06 Engine Treatment, 32-Ounce, Single Dura Lube Engine Treatment immediately helps your engine run cooler and quieter by reducing heat and friction a major cause of engine sludge Dura Lube offers four times more wear protection than your lubricants alone and contains no solid particles like PTFE, lead, molybdenum, or graphite For gas and diesel engines, compatible with synthetic and non-synthetic oils. Replace one quart of motor oil with Dura Lube Advanced Engine Treatment at every oil change Use on higher mileage vehicles or add the additional protection on newer engines, Dura Lube helps all engines last longer, run quieter and optimize fuel economy. Out performs oil treatment products because it treats the metal not the oil!