The standard AlSi9Cu3(Fe) aluminium alloy is mostly used for the production of the castings with the use of high-pressure casting. It is used in the car industry for manufacturing engine block carriers, gearbox housings, generator housings, turbocharger housings, etc.The AlSi9Cu3(Fe) alloys are characterized by relatively high mechanical properties, strength, and hardness, with slightly lower resistance to strain and corrosion. Besides chemical composition, melt treatment and the possibility of various heat treatments, the microstructure and mechanical properties of the alloy are significantly influenced by the composition of the return material.The development of microstructure is influenced by the increase of the returnable material in the melt during solidification and it can decrease mechanical properties of the final product. The aim of this research is to compare the mechanical properties is the comparison of the mechanical properties of the AlSi9Cu3(Fe) alloy immediately after,4 and 80 weeks after casting obtained with the application of 100 % returnable material. The metallographic testing showed that the microstructure of such alloy does not deviate significantly from usual practice obtained by using 50% or 80% of returnable material. Following microstructural constituents wereidentified: dendritic network of primary αAl, eutectic (αAl + βSi),primary βSi,needle-shaped β – Al5FeSi, α – Al15(Mn,Fe)3Si2 in polygonal shape and in the shape of Chinese scriptalong with irregularly shaped Al2Cu precipitated the interdendriticareas. Mechanical testing showed deviation of the yield strength from required values immediately after casting and 4 weeks after casting despite the same microstructure constituents. After 80 weeks, the effect of natural ageing led to the increase in yield strength and achievement of satisfactory mechanical properties in accordance with EN 1706 standard.