How does adding silicon affect the durability of metal alloys used in machinery? This study investigates the impact of silicon content (SC) and test parameters on the lubricated wear of Zn-30 wt.% Al-3 wt.% Cu-(0.5–5) wt.% Si alloys, revealing optimal composition for improved tribological properties. Six quaternary alloys with varying silicon content were produced by casting, and their wear properties were tested under different contact pressures (CP) and sliding velocities (SV) for two sliding distances (SD). The observations showed that silicon addition improved the tribological properties of the Zn-30Al-3Cu alloy, but exceeding 0.5% SC adversely affected these properties. Zn-30Al-3Cu-0.5Si alloy demonstrated the lowest friction coefficient (FC) and wear volume (WV) among the tested alloys, establishing its superior wear resistance. The non-linear regression analysis correlated the lubricated wear properties with test conditions, determining equations for the relationship between wear properties and test parameters. The equations determined provide useful information for industrial applications, enabling engineers to predict and optimize alloy performance under various operational conditions. Future research could explore the microstructural mechanisms behind the improved wear resistance and further refine the alloy composition for specific applications.