When you change your gear oil for manual gearbox, you add in together with fresh gear oil about half a bottle of Tufoil. The next change interval should be in accordance with your car manual.
In my case, I would like to change at 25,000 km. Gear oil is small in volume and low in cost. Try to go for the highest specs though, GL-6. These come from USA.
still no answer as to whether suitable for viscous LSD or not oso ?? hehehehe ... if can use then can use lorr ... cannot then cannot lorr .... nothing one maaa .. :D
viscous LSD is not the same as those clutch type LSD ... FYI .. :D
It is best to get to know type of differential oil you are using in order to check for compatibility. Please let us know. We will get US to give an opinion.