We systematically investigate a broad spectrum of thermodynamic and transport properties across various molecular weights of PDMS systems, including density, specific heat capacity, isothermal compressibility, viscosity, and thermal conductivity, to assess the precision, reliability, and applicability of five distinct force fields. Through extensive molecular dynamics (MD) simulations, we evaluate the predictive accuracy of these force fields under varying temperature and pressure conditions. Additionally, we analyze the dependence of material properties on molecular weight, offering insights into scaling behavior. The benchmarking process involves a detailed comparison of simulation results with experimental data, enabling the identification of each force field's strengths and limitations. Furthermore, we examine the sensitivity of the predicted properties to variations in force field parameters, providing valuable guidance for the refinement and development of force fields specifically optimized for polysiloxanes.