Abstract: Oil soluble polyether (OSP) has a good oil solubility and unique ether chain structure. Taking OSP as a base oil component of turbine oil is an efficient way to improve the performance of turbine oil. The performance of the oxidation resistance, detergency, and sludge generation trend and demulsification of the turbine oil with OSP was investigated. The test results indicate that with the increase of the OSP in base oil, the viscosity of the turbine oil does not change, but the viscosity index increases and the pour point decreases. The other indicators have no obvious change. It is concluded that OSP and the complex agent F-2 can match well. The turbine oil with OSP has a good oxidation resistance, detergency and demulsibility ability and can inhibit the sludge generation trend.