This Liqui Moly Hydraulic Lifter Additive is a 300ml treatment suitable for all commercial motor oils in gasoline and diesel engines, including those with diesel particulate filters (DPF). It has been tested and is safe for use with catalytic converters and turbochargers. The contents of one can are sufficient for up to 6 liters (6.34 U.S. QT) of motor oil. Please note, this product is not suitable for motorcycles with wet clutches. For optimal performance, a minimum oil filling of 3 liters (3.17 U.S. QT) is recommended. This additive effectively prevents hydro tappet noise, cleans lubrication holes and ducts within the oil circuit, promotes the accurate function of hydraulic lifters, and reduces wear. To use, add one 300ml can to up to 6 liters of motor oil at any time. Run the engine until warm after application. For a lasting effect, it should be added after each oil change. One 300 ml can is sufficient for up to 6 liters of motor oil. The product can be added at any time. After adding, run the engine until warm. Not suitable for use on motorbikes with wet clutches.