I have some diff oil sitting here for about 6 months, is there a shelf life for this stuff?

 

It was designed to be in service for many years, really. So, I don't see how sitting on a dry shelf for 6 months would cause any concern.

 

assuming the bottle is still sealed.

 

Actually its in the differential itself.. previous owner havnt drove his car for 6 months.

 

Hmm, that's a tough one. Oils oxidize over time, however, I'm unsure how that relates to diff oils and whatnot.

Your thread title is also misleading, as "shelf life" means "how long the oil lasts on the shelf", and not in your diff.

 

id change it just in case and avoid all that worrying