I had to lube the door latch this morning. It gets rough feeling after a while and needs some lube. I have been using Maxima chain wax (for motorcycle chains) because I have it handy and I LIKE the way it smells. When the door is warm (not hot!) it penetrates to the internals and really smooths it out. It sets, or dries, to a non-sticky lube that lasts a good long while. I know others use graphite powder or spray. Maybe when my chain wax is gone I will give that a go. That might be 10 years from now. I installed an auto oiler on my chain driven bike so I don't really use the wax for the bike anymore.
I also have PJ-1 chain lube for non O-ring chains but I only use that when the door is off and cold. It stinks when it warms up.
I also have PJ-1 chain lube for non O-ring chains but I only use that when the door is off and cold. It stinks when it warms up.