I bought this oil as a last chance before trading the job for a battery. This runs for 30 days but stops every 3 days or so. I've worked on it 3 times with no better results. I have used watch oil and it has never worked better. I noticed that the swing of the pendulum has improved noticeably and is surprisingly quieter. My friend's father made this watch 40 years ago. I think he'd be glad he's still working.