“…Consequently, it is necessary to develop a temperature-dependent viscosity model for accurately predicting the viscosity of various crude oils at different temperatures. Dozens of the temperature-dependent viscosity models for crude oils, or their fractions, have been reported by different researchers in the literature, which have been briefly reviewed by others. ,− However, as shown in section , these temperature-dependent viscosity models are quite different. Many of them may have some limitation, as they were developed on the basis of researchers’ own set of experimental data, data from the literature for some crude oils, and/or at a relatively narrow range of temperature. , The extrapolation of these models to other crude oils or other temperature ranges may result in low accuracy of the predictions.…”