The company who manufactures our oils guarantee us that these
lubricants will function as they should for at least 5 years. After this
we have no personal experience with with how our oils perform after such
a long time standing. 5 years is definitely no problem.
Within this time it is possible that the oil could change color
somewhat depending upon the amount and intensity of the ultra violet
rays that the oil is subjected to. As long as the oil is well shaken
before every use, then this also will have no effect upon the performance.
- Rohloff