Originally Posted by
davidad
I was at the bearing place late last year ordering the grease I use and asked. The clerk showed me a tube with an expiration date on it. That was news to me. Some of the additives are volatile and that must affect shelf life.
Probably some high-performance MIL SPEC grease. Very common in the aerospace industry. Even stuffs like RTV come with expiration date. Course one can always re-cert a batch that has gone past expiration.