Of the force fields tested in this work, we determine LOPLS-AA to be the most suited to modelling heat transport in PAO4 fluid. Whilst all force fields predicted the fluid density well, we saw large differences between simulation and experimental results with for the thermal conductivity and viscosity calculations. Whilst TraPPE-UA made the best predictions for the fluid thermal conductivity, we observed significant deviations from the experimental viscosity at both high and low temperatures. Whilst all three atomistic force fields tested all showed similar over predictions in thermal conductivity, LOPLS-AA provided significantly better predictions for the viscosity at both high and low temperatures. Therefore, we chose to use the LOPLS-AA force field to model the fluid for the remainder of simulations in this study.