Having identified that your car has LSD fitted, I guess the next question to ask would be "does the LSD still work properly?"
I still need to do a bit more reading on how the Torsen LSD works, but a clutch-pack LSD (as fitted in my Nissan Skyline), as well as a viscous LSD, typically work great up to about 100,000km, and then gradually lose their ability to "limit the slip" - so to speak.
The keyword here is typically - as always, the lifespan of the LSD depends heavily on usage, on how well the diff is sized for the vehicle, etc etc...
The aging mechanism is usually wearing of the clutch (in a clutch pack LSD), or degradation of the fluid (in a viscous LSD). So I'm curious as to what it is in a Torsen LSD...