Prevents and reduces hydraulic lifter noise. Cleans oil passages to remove oil flow restrictions. Restores proper hydraulic lifter function and reduces wear. For all 4-stroke gasoline and diesel engines, with or without turbochargers. Mixable with most commercially available motor oils. Safe for use with catalytic converters and particulate filters (GPF/DPF). Contents (300 mL) is sufficient for 3-6 Liters (0.8 gal. to 1.6 gal.) motor oil. Not suitable for motorcycles with wet clutches.