For each force field, the viscosity was calculated at 40 °C and 100 °C to enable comparison with experimental data. The results are shown in Table . The viscosity calculated with the united-atom force field was under predicted by 84% at 40 °C and 68% at 100 °C with respect to experimentally obtained values of 16.3 and 3.7 cSt at 40 and 100 °C, respectively. Of the atomistic force fields, AMBER performed the worst, resulting in over-estimations of 204% at 40 °C and 122% at 100 °C. This is consistent with previous simulations, which suggested that AMBER resulted in crystallisation of hydrocarbons under ambient conditions. CHARMM-36 under predicted the viscosity by 48% at 40 °C and 37% at 100 °C. LOPLS-AA performed the best, yielding a 36% underprediction at 40 °C and a 12% underprediction at 100 °C.