High viscosity base fluids based on oil compatible polyesters

A lubricating composition, comprising:

• (A) 20 to 60% by weight of at least one polyester prepared from an internal epoxide derived from an internal olefin comprising 10 to 24 carbon atoms, or from a diol derived from the internal epoxide, and at least one saturated linear aliphatic diacid comprising 5 to 13 carbon atoms,
• wherein the polyester has a number-average molecular weight of from 1,000 to 15,000 g/mol, determined by size exclusion chromatography (SEC) using polymethylmethacrylate standards;
• (B) 40 to 80% by weight of a base oil selected from the group consisting of API Group II oils, API Group III oils, API Group IV oils, and a mixture thereof;
• and
• (C) 0 to 5% by weight of one or more additives,
• based on a total weight of the lubricating composition.