Chromium HVI-PAO bi-modal lubricant compositions

A method of using an oil formulation comprising:

• providing an oil formulation including
• a) a chromium catalyzed HVI-PAO at from 34.9 to 43.9 wt % of the oil formulation with a viscosity of 150 cSt kv 100° C. and a viscosity index greater than 100;
• b) a second chromium catalyzed low viscosity PAO base stock at from 23 to 28 wt % of the oil formulation with a viscosity of 2. cSt kv 100° C.;
• c) di-octyl sebacate ester with a viscosity of at least 2 and less than 6 cSt kv 100° C., the di-octyl sebacate ester comprising about 20 weight percent of the oil formulation;
• d) the oil formulation having a viscosity index of greater than or equal to 208;
• and
• wherein the oil formulation exhibits a moisture corrosion resistance as measured by ASTM D7038/L-33-1 of at least 9.4 and a traction coefficient over a range of 0 to 30% slide-to-roll ratio of less than 0.02 (measured at a speed of 2 m/sec, a pressure of 1.00 (Pa and a temperature of 80 deg. C.), and
• using the oil formulation as an automotive gear oil.

A method of blending an oil formulation with favorable energy efficiency and low temperature properties comprising

• a) obtaining a chromium HVI-PAO at from 34.9 to 43.9 wt % of the oil formulation with a viscosity of 150 cSt kv 100° C. and a viscosity index greater than or equal to 208;
• b) obtaining a second chromium catalyzed low viscosity PAO base stock at from 23 to 28 wt % of the oil formulation with a viscosity of 2 cSt kv 100° C.
• c) obtaining di-octyl sebacate ester with a viscosity of at least 2 and less than 6 cSt kv 100° C. comprising about 20 weight percent of the oil formulation;
• and
• e) blending the chromium HVI-PAO with the second chromium catalyzed low viscosity PAO base stock, and the di-octyl sebacate ester to formulate an oil formulation with favorable traction properties,
• wherein the oil formulation exhibits a moisture corrosion resistance as measured by ASTM D7038/L-33-1 of at least 9.4 and a traction coefficient over a range of 0 to 30% slide-to-roll ratio of less than 0.02 (measured at a speed of 2 m/sec, pressure of 1.00 GPa and a temperature of 80 deg. C.).