Viscosity experiments are one of the most commonly reported results from PVT laboratories due to its importance to transport calculations in engineering. Viscosity estimation for oil samples is an important stage to properly determine a complete set of thermodynamic and transport properties for oil samples. In general, such experimental data are provided in a dedicated viscosity data report . However, mixture viscosity model fitting is a challenging task , usually performed with high associated errors when compared with experimental data. Given the importance of viscosity as a transport property, improving viscosity estimates is a relevant topic for PVT analysis.