This study aims to evaluate the agreement between the physicochemical properties of nine fully synthetic SAE 5W30 direct injection gasoline engine oils (GDI) and the corresponding manufacturer declared data sheet, as well as the limits specified by standard specifications, aiming to identify potential cases of manufacturing defect or counterfeit products of international brands. The samples analyzed include LIQUI MOLY, RAVENOL, Castrol MAGNATEC, Shell HELIX, mabanol, S-OIL SEVEN, VENOL, ZIC X9, and ALMOG Gamma. Experimental analyses were performed in accordance with ASTM standards, covering kinematic viscosity at 40°C and 100°C, density, flash point, evaporation loss and viscosity index. The results showed a generally high agreement between declared and experimental values, with minor deviations observed in kinematic viscosity at 40°C for some samples. For Castrol, Shell, and S-OIL SEVEN, these oils demonstrated favorable physicochemical properties; however, further engine performance testing is required to confirm their resistance to deposits and LSPI................. Keywords:................Engine, GDI, Lubricant oil, Viscosity Index, Flash point, Evaporation, Density.