Estolide compositions exhibiting superior high-performance properties

A composition comprising:

• (i) about 25% to about 60% by weight of an estolide base oil having a kinematic viscosity from about 2 to about 9 cSt at 100° C., said estolide base oil comprising at least one estolide compound selected from compounds of Formula I:
• wherein
• x is, independently for each occurrence, an integer selected from 1 to 10;
• y is, independently for each occurrence, an integer selected from 1 to 10;
• n is an integer selected from 0, 1, and 2;
• R1 is an unsubstituted C1 to C22 alkyl that is saturated and branched or unbranched;
• and
• R2 is an unsubstituted C1 to C22 alkyl that is saturated and branched or unbranched,
• wherein x+y is, independently for each fatty acid chain residue, an integer selected from 13 to 15, and wherein each fatty acid chain residue is unsubstituted;
• (ii) about 30% to about 65% by weight of a non-estolide base oil selected from at least one of a synthetic hydrocarbon oil or a semi-synthetic hydrocarbon oil;
• (iii) at least one metal salt detergent inhibitor;
• and
• (iv) at least one antioxidant,
• wherein the composition exhibits a wear rating of 60 μm or less, and a viscosity increase of 150% or less at 40° C., when tested according to ASTM Method 7320,
• wherein the estolide base oil has an iodine value of less than 10 cg/g,
• and wherein the composition has a bio-based content of at least 25% by weight when tested according to ASTM Method D6866.