Comparative oxidation study of aviation lubrication oil

The kinematic viscosity, lubricity, acid number of 928 and 50-1-4Φ aviation lubrication oils are investigated in this paper. Oil samples were oxidized at 150 and 175°C for 120 h to evaluate their performance variation. The results suggest that 928 lubrication oil is easily oxidized and generates acidic products, which increase its acid number. The comparative analysis revealed that 928 lubrication oil tends to react in oxidizing atmosphere, which increases its viscosity, acid number, and weight-bearing performance. Meanwhile, wear scar diameters of both oxidized oil samples were found to be nearly the same.