| abstract |
The present invention provides a gear oil composition. The composition comprises a sufficient amount of an isomerized base oil, a matrix of the base oil comprising at least one polyalphaolefin for the composition of the gear oil. The gear oil composition has an average volume change, also a rubber seal between -10 and +10, a change in Shore A hardness between -7 and +10 when tested with SER NBR2B at 100 ° C, 168 hours for DIN53521 and DIN53505, an increase in viscosity of less than 3% by a test of stability in oxidizing conditions of US Steel S-200, a precipitation of less than 1% by the test of stability in oxidizing conditions of US Steel S-200, and a load of Timken OK greater than 27.24 kg (60 pounds). Isomerized base oil has consecutive numbers of carbon atoms and less than 10% by weight of naphthenic carbons per n-d-M. In one embodiment, the sufficient amount of the isomerized base oil ranges from 20 to 75% by weight based on the total weight of the gear oil composition. |