A NOVEL COMPOSITION IS DISCLOSED THAT IS PARTICULARLY USEFUL AS A LUBRICANT VISCOSITY INDEX IMPROVER. THE COMPOSITION COMPRISES BRANCHED C30-C10000 HYDROCARBONS THAT HAVE A BRANCH RATIO OF LESS THAN 0.19 AND VISCOSITY AT 100°C BETWEEN 725 MM2/S AND 15,000 MM2/S. THE NOVEL COMPOSITIONS COMPRISE THE PRODUCT OF THE OLIGOMERIZATION OF C6 TO C20 ALPHO-OLEFIN FEEDSTOCK, OR MIXTURE THEREOF, UNDER OLIGOMERIZATION CONDITIONS AT A TEMPERATURE BETWEEN - 20°C AND +90°C IN CONTACT WITH A REDUCE VALENCE STATE GROUP VIB METAL CATALYST ON POROUS SUPPORT. THE COMPOSITIONS HAVE VISCOSITIES AT 100°C BETWEEN 725 MM2/S AND 15,000 MM2/S. USING THE FOREGOING COMPOSITIONS THE ADMIXTURE WITH MINERAL OIL AND SYNTHETIC LUBRICANTS PROVIDES NOVEL LUBRICANT BLENDS THAT SHOW AN ELEVATED VISCOSITY INDEX. THE MIXTURES ALSO SHOW AN INCREASED STABILITY TO SHEAR STREES. THE MIXTURES ALSO SHOW AN INCREASED STABILITY TO SHEAR STRESS AT HIGH TEMPERATURE WITH ALL BLENDS NOTABLE BY EXHIBITING NEWTONIAN FLOW.
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