Patent ID: 6962895

Claim:
A multigrade lubricating composition comprising at least about 30% by weight of at least one mineral oil having a kinematic viscosity of less than about 8 cSt at 100° C., (A) from about 15% to about 40% by weight of at least one polymer having a {overscore (M)}w less than 50,000, the polymer being selected from polyalkylene, terpolymers of ethylene, propylene and a diene monomer, and mixtures thereof, and (B) up to about 30% by weight of at least one fluidizing agent, provided that when the fluidizing agent is a polyα-olefin having a kinematic viscosity from about 2 to about 30 cSt at 100° C., then the polyα-olefin is present in an amount up to about 12% by weight, wherein the lubricating composition is a gear oil and wherein the lubricating composition has a shear loss of less than about 15% in the 20 hour taper bearing shear test.