Liqui Moly Engine Flush is a powerful cleaning fluid that removes oil-soluble and insoluble deposits from the engine interior, suspending contaminants for removal during the next oil change. It restores engine performance, reduces wear, and extends service life. Suitable for gasoline and diesel engines, including those with toothed belts running in oil, one 300 ml bottle treats up to 6 liters of oil. Add at operating temperature before oil change, idle for 10 minutes, then replace oil and filter. Not for motorcycles with wet clutches.