Door hinge oil (machine oil)
What lubricant to use to silence squeaking door hinges : Door Hinge Oil (machine Oil)
Quote from Article entitled What lubricant to use to silence squeaking door hinges:
Caring for the door doesn’t consist not only in timely hinges’ lubrication in order to prevent the squeak, it also goes for the door lock. If its regularly lubricated you will hardly face a jammed or wedged lock which is difficult or impossible to open. That is why you should not forget about regularly locks’ lubrication.
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