Patent ID: 8329966

Claim:
A synthetic base oil composition comprising a dialkyl aromatic compound made via a one-step process by reacting benzene with olefins, wherein said synthetic base oil composition has a minimum viscosity index of 120, a maximum pour point at −40° C., a Selby-NOACK volatility of no higher than 13%, and a cold cranking stimulated viscosity at −40° C. of no higher than 20,000 cp, wherein said dialkyl aromatic compound has two alkyl substituents of carbon chain length from C 11 to C 18 and the content of total 2-positional linear isomers in the dialkyl aromatic compound is within a range from 1.6% to no more than 25%, and wherein the branching characteristics of said alkyl substituents has a total methyl number (“TMN”) determined by C 13 NMR spectroscopy of from more than 2.15 to less than 3.25 or has a branching index (“BI”) of from more than 0.15 to less than 1.25, wherein TMN is calculated by dividing the sum of integrated areas for all methyl groups by the total integration area for all aliphatic carbons and multiplying the result by the averaged chain length carbon number, and wherein BI is TMN minus 2 (two terminal methyl carbons).