Your clock has not been serviced recently.
Modern clock oils are designed to last for 5 years or so. If it's been longer than that, chances are you are attempting to run your clock dry. This can damage the clock. You should take it to a qualified clock repairperson for a movement overhaul.
If you live in Southern California, we hope you'll choose Prestige Clock Repair. If you're not in our area, see our page for help in finding a repairperson.
Prestige Clock Repair
Bluff Heights (near 4th and Junipero)
DON'T LIVE IN SOUTHERN CALIFORNIA?