naturist wrote:
Ack, no! Oil in a lock cylinder works temporarily but is a long term kiss of death. It attracts and traps dust which kills the lock in short order.
Locks should only ever be lubed with dry graphite.
Totally true on a properly functioning lock with no issues. I agree 100%
However, on a lock that will not open, and the intent is to get it to open one last time so it can be removed for replacement without destroying it, I would opt for thin penetrating oil to try to free it up. In this instance, thin oil will be a better choice.
If the OP can just get it to open, he won't have to drill it out and make a mess to remove the non functioning lock.
And yes, to all others, haul out the graphite! :)