The prediction of oil seals can be due to several causes such as the vibrations of the axle shafts, transmission shaft or change of tires not suitable for your car. The differential itself!
A common cause is the wear of the bearings which can create malfunctions on the entire differential and its internal components such as bevel gear, planetary satellites, thus creating play on the various components, also causing excessive vibrations which affect the differential.
The loss of fluids from the differential can be one of the first causes for an organ not working properly.