Low viscosity oligomer oil product, process and composition

A process for the selective production of synthetic fluid comprising 3.5 to 4.1 cSt viscosity at 100° C., with a Noack volatility weight loss of less than 16%, a Viscosity Index of greater than 120, a Pour Point lower than −50° C., and a viscosity at −40° C. of less than 3000 cSt by:

• (a) reacting first alpha olefin, excluding 1-decene, in the presence of a first catalyst to form vinylidene olefin;
• (b) reacting said vinylidene olefin with second alpha olefin, excluding 1-decene, in the presence of BF3 catalyst and a promoter system comprising mixture of at least one aprotic compound with at least one protic compound;
• (c) removing residual unreacted monomers and removing unreacted volatile liquids;
• (d) hydrogenating bottom product to produce synthetic fluid;
• (e) wherein said synthetic fluid comprises 3.5 to 4.1 cSt at 100° C.;
• (f) wherein said synthetic fluid comprises production without heavier than 4.1 cSt at 100° C. co-product;
• (g) recovering said synthetic fluid.