Patent ID: 7214648

Claim:
An engine crankcase lubricant, comprising: an effective amount of a base oil selected from the group consisting of Group I solvent refined mineral oils, Group II hydrocracked mineral oils, Group III severely hydrocracked oils or combinations thereof; an effective amount of a synthetic base oil selected from Group IV synthetic polyolefins, Group V synthetic oils comprising esters and napthenes, or combinations thereof; an effective amount of a dispersant inhibitor; an effective amount of a seal swelling agent selected from the group consisting of substituted sulfolane, phthalate plasticizer, dinonly phthalate plasticizer, dihexylpthalate plasticizer, sulfolanes, phenates, and combinations thereof; an effective amount of a molybdate compound selected from the group consisting of an oil soluble organo molybdenum, a sulfonated oxymolybdenum dialkydithiophosphate, a molybdenum dithiocarbamate, a molybdenum octoate, a molybdenum sulfide, and a molybdenum oxide; an effective amount of a viscosity improver selected from the group consisting of a polyisobutene, a polymethacrylate acid esters, a diene polymer, a polyolefin, a multifunctional viscosity diene polymer, a polyolefin and multifunctional viscosity improver, a styrene-butadiene rubber in mineral oil, a styrene isoprene viscosity improver, and combinations thereof; an effective amount of a corrosion inhibitor selected from the group consisting of a borate ester, a dimercapto, a benzotriazole, a triazole and combinations thereof; and an effective amount of a pour point depressant selected from the group consisting of a polymethacrylate, an alkylated bicyclic aromatic, a styrene ester, a polyfumerate, an oligomerized alkyl phenol, a dialky ester of phthalate acid, an ethylene vinyl acetate copolymer, and other mixed hydrocarbon polymers.