Alkylated naphthalene is an excellent class of synthetic fluids with significant thermo-oxidative and hydrolytic dependability, low volatility, and good solvency attributes. Alkylated naphthalene is classified as Group-V base oil by the American Petroleum Institute. However, alkylated naphthalene is hardly used as the sole base oil. It is basically used in a lubricant formulation, replacing a portion of Group-II, Group-III, or PAO base oil. Incorporating alkylated naphthalene in a formulation increases the thermal and thermo-oxidative strength of the formulation. This improves the overall service life and performance of lubricants.