NOVELTY - Producing saturated hydrocarbon component involves oligomerizing and deoxygenizing a feedstock comprising at least one component selected from 4-38C carboxylic acids, 4-38C carboxylic acids esters, 1-11C alcohols, 4-38C carboxylic acid anhydrides, and 4-38C alcohols, where the feedstock contains unsaturated and/or polyunsaturated compounds (at least 50 wt.%).    USE - For producing saturated hydrocarbon components e.g. base oil; for producing gasoline, solvent, and/or diesel fractions (claimed).    ADVANTAGE - The volatility of base oil produced by the process having kinematic viscosity of 3 - 8 cSt, is not greater than2271.2asterisk(KV100)-3.5373%. The base oil has 14C isotope content of at least 100%. The process involves use of renewable raw materials instead of non-renewable feedstocks for lowering carbon dioxide emissions contributing to the greenhouse effect. The hydrocarbon prepared by the method has very low pour points favorable for base oil applications and has a superior viscosity index. The base oil has preferable effects on the environment and for end users than traditional mineral base oils. The high-quality saturated hydrocarbon component of biological origin has excellent viscosity and low temperature properties. The base oil produced by the method has viscosity index of at least 100 (preferably at least 110, especially at least 128) as determined by ASTM D 2270; has viscosity KV100 of 4 - 7 mm2/s; sulfur content of less than 300 (preferably less than 50, especially less than 1) parts per million measured by ASTM D 3120; nitrogen content of less than 100 (preferably less than 10, especially less than 1) parts per million measured by ASTM D 4629; and has cetane number of more than 40 (preferably more than 55, especially more than 70). The base oil prepared by the method is hydrolytically more stable and has a structure not decomposing under humid conditions. The base oil prepared by the method is more compatible than conventional base component derived from crude oil.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a base oil containing (wt.%): saturated hydrocarbons (at least 90), mononaphthenes (20 - 90), and linear paraffin (not greater than20), where at least 50 wt.% of the saturated hydrocarbons is not greater than9C hydrocarbon.