Non-newtonian engine oil lubricant compositions for superior fuel economy

An engine oil lubricant composition comprising a polyalpha olefin base oil component in an amount of about 50 wt % to about 90 wt % based on a total weight of the engine oil lubricant composition, wherein the polyalpha olefin base oil component is a Group IV base oil and has a Noack volatility of about 12.5% to about 15%;

• further comprising a Group II base oil component in an amount of about 0.1 wt % to about 50 wt % based on the total weight of the engine oil lubricant composition, wherein the Group II base oil component comprises a gas to liquids base stock;
• further comprising a mixed glyceride ester comprising C14, C16, and C18 molecules, wherein a majority of the C14 molecules are linear, a majority of the C16 molecules are linear, and a majority of the C18 molecules are linear;
• further comprising a first succinimide dispersant that is non-borated and is present in an amount of about 4.3 wt % based on the total weight of the engine oil lubricant composition, and wherein the first succinimide dispersant has a peak molecular weight of about 4,000 to about 5,000, as determined using gel permeation chromatography with polystyrene calibration standard;
• further comprising a second borated succinimide dispersant in an amount of about 3.5 wt %, based on the total weight of the engine oil lubricant composition, wherein the second succinimide dispersant has a peak molecular weight of about 5,000 to about 5,500, as determined using gel permeation chromatography with polystyrene calibration standard, wherein the second borated succinimide dispersant comprises from about 0.1 moles to about 0.87 moles of boron per mole of dispersant reaction product;
• further comprising a polymeric ethylene oxide friction modifier in an amount of about 0.1 wt % to about 5.0 wt % based on the total weight of the engine oil lubricant composition;
• further comprising a corrosion inhibitor comprising alkylated (C8-C20) phenoxyacetic acid;
• wherein the engine oil lubricant composition has a kinematic viscosity at 100° C. of about 10 cSt or less, a high temperature high shear viscosity at 150° C. of about 2.2 cP or less, and a Noack volatility of about 20% or less.