The Liqui Moly 2640 Engine Flush is a highly effective cleaning fluid designed to clear the engine interior of troublesome deposits. It rapidly and effectively dissolves sludge and lacquer formers, bringing all types of oil-soluble and oil-insoluble residues into suspension for removal during the next oil change. Using this engine flush ensures that a cleaned engine, filled with fresh oil, can develop its full performance characteristics. It also helps reduce engine wear and extends the service life of the catalytic converter. Suitable for all commercially available motor oils in gasoline and diesel engines, including those with diesel particulate filters (DPF), and is turbocharger and catalytic converter tested.