Oldest unopened oil in your stash?

Oct 10, 2021
Ok i am new here. And please dont attack.. I had about 24 cans of oil in the old cardboard cans. Heavy weight multi vis for my old superduty firebird sd. 455 v8. I must have tossed out 12 cans of 10 w 40 old pennzoil as well.. so... did I throw away stuff that was valuable.. ??? Or stuff that was collectable??
When my mother passed away ten years ago I had to clean stuff up in hurry and i knew none of my vehicles or generators , tractors , lawn mowers could use that weight oil at a 40 year old spec.
I did save my oil push into the can spout opener thing. I used it a lot back in the day..