So I've been having issues with my limited slip differential. It definitely wasn't working. I've been spinning one wheel, and on the data logs I could see that the my accaleration from the start was worse than other's. It's already my second Torsen, and it's been there for just one year.


From the previous experience I've remembered that the oil was important: with the oil without limited-slip additive, the diff was not working well (even though Torsen people say that this additive is not needed). This made me think that maybe the oil got worn out. And changing the oil is much cheaper than changing the diff. I went and changed the oil. What a miracle! Now the diff works again!


So it looks like the secret recipe for Torsen diffs is: change the oil often, don't skimp!