stability and si seal compatibility application_number US 57766095 A description a turbo oil having unexpectedly superior load carrying capacity comprises a major portion of a synthetic base oil selected from diesters and polyol ester base oil preferably polyol ester base oil and minor portion of a load additive package comprising a mixture of amine phosphate and sulfur containing carboxylic acid scca the diester basestock which can be used in the high load carrying lube composition of the present invention is formed by esterification of linear or branched c 6 to c 15 aliphatic alcohols with one of such dibasic acids as sebacic adipic azelaic acids examples of diester are di 2 ethyhexyl sebacate di octyl adipate the preferred synthetic base stock which is synthetic polyol ester base oil is formed by the esterification of aliphatic polyols with carboxylic acids the aliphatic polyols contain from 4 to 15 carbon atoms and have from 2 to 8 esterifiable hydroxyl groups examples of polyols are trimethylolpropane pentaerythritol dipentaerythritol neopentyl glycol tripentaerythritol and mixtures thereof the carboxylic acid reactants used to produce the synthetic polyol ester base oil are selected from aliphatic monocarboxylic acids or a mixture of aliphatic monocarboxylic acids and aliphatic dicarboxylic acids the carboxylic acids contain from 4 to 12 carbon atoms and includes the straight and branched chain aliphatic acids and mixtures of monocarboxylic acids may be used.