In this work, we performed comprehensive benchmarks of PDMS force fields to evaluate their performance in predicting various thermodynamic and transport properties through molecular simulations. Considering their diverse characteristics and parameterization levels, five force fields were employed, namely, united-atom from Frischknech and Cirro, improved Class II model from Huang et al., COMPASS, OPLS-AA, and Dreiding. Amoung these models, the Frischknech's united-atom model and Huang's all-atom model are both specifically parameterized for PDMS. Three universal force-fields, i.e., COMPASS, OPLS/AA and Dreiding, are also included for comparison. Despite their widespread use, these force fields differ significantly in their parameterization processes, particularly in their relevance to polydimethylsiloxane (PDMS) systems. The COMPASS force field incorporates specific parameterizations tailored for siloxane chemical environments, enabling it to accurately capture a broad spectrum of molecular interactions. In contrast, the Dreiding 20 and OPLS-AA force fields, although general-purpose all-atom models designed for organic molecules, lack explicit descriptions of siloxane-specific interactions. Consequently, we recalculated the partial charges for these models to enhance their applicability to PDMS systems, ensuring a more accurate representation of the unique chemical environment.