The experimental data on the viscosity and thermal conductivity (TC) of ethylene glycol (EG)-based hybrid nanofluids (HyNFs) dispersed with a SiC�CuO/C nanocomposite (NC) is reported for the first time. The rheological behavior and dynamic viscosity have been analyzed with a computer controlled rotational rheometer over a temperature range from 298.15�353.15 K and shear rate from 20 to 200 s�1. The TC was measured using transient hot-wire method for NF concentrations up to 3.13 wt. The effect of the temperature and volume fraction of the nanoparticles (NPs) on the thermophysical properties were examined under atmospheric pressure. The experimental findings revealed that the TC increases with the concentration and temperature, while the viscosity increases with concentration and decreases with temperature as expected. HyNF exhibit substantially higher TC and viscosity enhancement compared to single-particle based NF under similar conditions. The enhanced properties of the HyNF could be attributed to the synergetic effects of the composite particles and the underlying physical mechanism in the fluid medium. The existing theoretical models failed to predict the experimental data. Herein, a new correlation is presented as a function of concentration and temperature for the TC and viscosity. © 2019 Elsevier B.V.