I've owned a number of RJ's pocket holsters for several years and use wax rather than oil for their maintenance. Back in the days when I owned horses and was using neatsfoot oil to treat the leather tack, I would also use it on my holsters. Neatsfoot oil can be pretty messy, though, and I no longer use it for holster maintenance.
Most of my pocket holsters are black. If one of them begins to lose color at the wear points, I use alcohol to strip off the wax, re-dye it with Fiebing's Leather Dye, and then reapply the wax.
If you can find it, Renaissance Wax is about as good as it gets. Otherwise, I use plain old Kiwi Paste Polish (the soldier's friend).
