Method for producing a light metal cast component with the steps: - providing a melt from an aluminium casting alloy that contains silicon with 3.5 to 5.0 weight percent, magnesium with 0.2 to 0.7 weight percent, titanium with 0.07 to 0.12 weight percent, boron with at most 0.012 weight percent, optionally further alloy elements with together less than 1.5 weight percent, the rest aluminium as well as unavoidable impurities, wherein the melt is produced from a base melt that contains aluminium, a first grain refiner of an aluminium-silicon-alloy that contains a proportion of silicon of maximal 12.5 weight percent and aluminium, and a second grain refiner of an aluminium-titanium-alloy that contains as alloy elements at least titanium, boron and aluminium, wherein the melt, in relation to the total weight, contains in total an amount of 0.1 to 5.0 weight percent of the grain refiner of the aluminium-silicon-alloy and of the grain refiner of the aluminium-titanium-alloy; - casting the melt into a casting- and forming tool by a low-pressure method at a low first pressure, in particular by means of gravity casting or low-pressure casting, - after completely filling the casting- and forming tool, applying a pressure to the solidifying melt in the casting- and forming tool with a second pressure that is larger than the first pressure, and - when the melt is at least mostly solidified to the component, compacting the component, that is at least mostly solidified from the melt, in the casting- and forming tool at a third pressure that is larger than the second pressure, wherein the further alloy elements are at least one of: strontium (Sr) with 100 to 150 ppm, tin (Sn) with less than 250 ppm, copper (Cu) with less than 1.0 weight percent, in particular less than 550 ppm, nickel (Ni) with less than 550 ppm, titanium boride (TiBor) with less than 30 ppm, zinc (Zn) with less than 550 ppm, chromium (Cr) with less than 500 ppm, iron (Fe) with less than 0.7 weight percent and manganese (Mn) with less than 0.15 weight percent. - providing a melt from an aluminium casting alloy that contains silicon with 3.5 to 5.0 weight percent, magnesium with 0.2 to 0.7 weight percent, titanium with 0.07 to 0.12 weight percent, boron with at most 0.012 weight percent, optionally further alloy elements with together less than 1.5 weight percent, the rest aluminium as well as unavoidable impurities, wherein the melt is produced from a base melt that contains aluminium, a first grain refiner of an aluminium-silicon-alloy that contains a proportion of silicon of maximal 12.5 weight percent and aluminium, and a second grain refiner of an aluminium-titanium-alloy that contains as alloy elements at least titanium, boron and aluminium, wherein the melt, in relation to the total weight, contains in total an amount of 0.1 to 5.0 weight percent of the grain refiner of the aluminium-silicon-alloy and of the grain refiner of the aluminium-titanium-alloy; - casting the melt into a casting- and forming tool by a low-pressure method at a low first pressure, in particular by means of gravity casting or low-pressure casting, - after completely filling the casting- and forming tool, applying a pressure to the solidifying melt in the casting- and forming tool with a second pressure that is larger than the first pressure, and - when the melt is at least mostly solidified to the component, compacting the component, that is at least mostly solidified from the melt, in the casting- and forming tool at a third pressure that is larger than the second pressure, strontium (Sr) with 100 to 150 ppm, tin (Sn) with less than 250 ppm, copper (Cu) with less than 1.0 weight percent, in particular less than 550 ppm, nickel (Ni) with less than 550 ppm, titanium boride (TiBor) with less than 30 ppm, zinc (Zn) with less than 550 ppm, chromium (Cr) with less than 500 ppm, iron (Fe) with less than 0.7 weight percent and manganese (Mn) with less than 0.15 weight percent.