<p>The thermal and rheological behavior of silicone dielectric grease and nanoparticles loaded with silicone dielectric grease have been explored in this work. Three nanoparticles, namely Li₂O, Fe₃O₄, and P₂O₅, are mixed with silicone dielectric grease to prepare the composite. The thermal degradation <i>via</i> thermogravimetric analysis reveals the prolonged heat-absorbing nature of Fe₃O₄-loaded grease, whereas the hygroscopic nature of P₂O₅-loaded grease has been revealed. The loading of nanoparticles enhances the viscosity of grease by tenfold. The rheological study reveals the superiority of Li₂O-loaded grease for electrical applications. The Fe₃O₄-loaded grease further shows an enhanced viscoelastic nature. The thermogravimetric and rheological analyses reveal the specific characteristic improvement with the addition of nanoparticles in grease and hence the tuneability of grease for specific application can be demonstrated.</p> Graphical abstract <p></p>