What is the shelf life of blower oil?

All of the blower lubricants carried by pdblowers should be stored in a clean dry location, kept above freezing.  While our main three lubricants are very similar and can be assumed to have similar lifespan, each manufacturer has provided varying guidance:

For the greases used on blowers, the ASME standard shelf life is 1 year.  After this time the thickening agents will start to separate.