Thanks,guys.It's not the sheaths I oil, I only oil the knife blades and I do not store the knives in the sheaths both are kept seperate.

The room is not climate controlled,Tune,but because of its location tends to stay much cooler than the rest of the house,which of course is the reason I chose it for storing my knives.

I wax the sheaths to offer an additional protective layer,but should the sheaths also be in protective cases?

All of my knives are in Randall zip up protective, cases of course.

marc.