Estolide compositions exhibiting high oxidative stability

A composition comprising a combination of an estolide base oil and at least one amine antioxidant, said combination having a time of at least 1000 minutes when tested in a rotating pressurized vessel oxidation test using ASTM Method 2272-11,

• wherein the estolide base oil has an acid value equal to or less than 0.2 mg KOH/g, and comprises at least one estolide compound selected from compounds of Formula I:
• wherein
• x is, independently for each occurrence, an integer selected from 0 to 20;
• y is, independently for each occurrence, an integer selected from 0 to 20;
• n is an integer greater than or equal to 0;
• R1 is an optionally substituted alkyl that is saturated or unsaturated, and branched or unbranched;
• and
• R2 is an optionally substituted alkyl that is saturated or unsaturated, and branched or unbranched,
• wherein each fatty acid chain residue of said at least one estolide compound is independently optionally substituted.