Patent ID: 8540869

Claim:
A method of selecting two or more base oils to formulate a base oil blend with improved thickening efficiency, wherein the selecting is based on compositional properties of the two or more base oils, the method comprising: measuring a weight percentage naphthenic carbon of a higher viscosity base oil, wherein the higher viscosity base oil comprises one or more from the group consisting of: a medium-light base oil and a medium base oil; measuring a weight percentage naphthenic carbon of a lower viscosity base oil, wherein the lower viscosity oil comprises one or more from the group consisting of: an extra-light base oil and a light base oil; determining a first difference between the weight percentage naphthenic carbon of the higher viscosity base oil and the weight percentage naphthenic carbon of the lower viscosity base oil; determining the first difference is within a first numerical range, wherein the first numerical range is between 0.10 and 1.5 weight percentage; after determining the first difference is within the first numerical range: selecting the higher viscosity base oil; selecting the lower viscosity base oil; blending the higher viscosity base oil and the lower viscosity base oil to formulate a base oil blend; blending the base oil blend with a performance additive package to form a base blend; and blending the base blend with an amount of a high molecular weight polymer viscosity modifier to form a finished lubricant.