Nice to know never new that.I work for an oil company lads...
The general rule of thumb is motor oils reach the expiration date at 5 - 7 years after blending (Non Synthetic vs. Synthetic). Lubes and grease hang in there until 7 to 8 years of age.
The oil doesn't go bad, it's the additives that have the issues after a certain point.
Please check with your favorite blender for actual life spans.