Shear-stable oil compositions and processes for making the same

An oil composition comprising a first component and a second component different from the first component, wherein:

• the first component is a base stock comprising multiple molecules of a first type each having multiple pendant groups, where (i) the average pendant group length of the longest 5%, by mole, of the pendant groups of all of the molecules of the first type have an average pendant group length of Lpg(5%), where Lpg(5%)≥5.0;
• and (ii) a portion of the molecules of the first type have a number-average molecular weight greater than or equal to 20,000;
• the second component comprises multiple molecules of a second type each comprising two terminal carbon chains, where (i) the number-average molecular weight of the second component is no greater than 2,000;
• and (ii) the two terminal carbon chains have chain lengths equal to or greater than 5.0 and do not share a common carbon atom;
• a single molecule of the second type is capable of adjoining two molecules of the first type via van der Waals force between the pendant groups of the molecules of the first type and the two terminal carbon chains in the single molecule of the second type to form a first complex structure, the first complex structures comprising a first heavy fraction thereof having an equivalent number-average molecular weight of at least 45,000;
• wherein the molecules of the first type comprise polyalpha-olefin (“PAO”) molecules having an average isotacticity of at least 60 mol %;
• wherein the first component has a Kv(100° C.) of less than 400 cSt;
• and
• wherein the oil composition comprises from 5 to 35 weight percent of the second component relative to the total weight of the first and second components and from 65 to 95 weight percent of the first component relative to the total weight of the first and second components.