Alkylated naphthalene used in lubricant-grade oils are produced by alkylation of naphthalene in the presence of a catalyst. Alkylated naphthalene is categorized as a Group-V base oil by the American Petroleum Institute (API). However, alkylated naphthalene is rarely used as a sole base oil. It is primarily used in a lubricant formulation, replacing a portion of a Group-II, Group-III, or PAO base oil.
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