And if you have one or getting on use it or your loose as I have done.
I never touched diff lock in the 10 years I owned my RR, and never touched my disco’s diff lock until the heavy snow of 2011/12 but then it was only for a couple of days, and surprise it did work and so stayed on track, instead of me drifting on round about’s (bringing the back around) which is fun.
For a few years now I’ve never be able to select low or diff lock on the disco, even though the exposed linkage is well lubricated, not an issue as I don’t need it, but if you do... use it, or maybe have the task of stripping down the top of the transfer box to free up the selector