Originally Posted by archeryrob

Most old calls were treated like the wood fishing plug makers treated the lures. You had about 60% boiled linseed oil with 40% mineral spirits and submerged it for a bit to soak it up. Some guy use different oils and some soak them a few days. Then left to dry and the linseed oil stayed in it. You could re-oil it if you if you thought it needed it, BUT you would need to remove the reed and put it back. If you don't know much about tuning a call, I would leave well enough alone!!

It is probably just fine as it is if you let it dry good after using it and take care of it.