Machine learning-based estimation of nano-lubricants viscosity in different operating conditions

•Eight machine learning algorithms were used to estimate viscosity of nano-lubricants.•The results reveal that the trained MLP and CNN models are the most accurate methods.•The effects of amount of MWCNT, nanoparticle, type of lubricant, temperature, shear rate, and solid volume fraction on viscosity are also ascertained utilizing sensitivity analysis.