Abstract: The performance comparison of domestic low viscosity PAO lubricating oil and imported PAO with similar specification in lubricity, corrosivity and thermal oxidation stability was conducted by measuring the acid value, pour point and viscosity index, combined with differential scanning calorimetry (DSC) technique. It is found that temperature has a little influence on acid value and pour point, different from viscosity. The viscosity of domestic PAO decreases with increasing temperature, but with less variation range compared with the imported oil. The differential scanning calorimetry (DSC) indicates that the thermal stability and the sensitivity to anti-oxidation agent are close to each other. At higher temperature, the amine type antioxidant shows better anti-oxidation ability compared with the phenol antioxidant.

Key words: poly α-olefin lubricating base oil, physico-chemical property, oxidation stability, differential scanning calorimetry