The icing on the cake to use them is when I cleaned the bottles up. The labels weren't in the greatest shape. But it did allow an opportunity to take better pics of the older bottles that had glare from my first images.
They may be worth something in a number of years to collectors. I've got a complete case of Chevron Supreme 10W-30 SL which for one reason or another never started to use. As others have mentioned, good lawn mower oil. Older oil, still in cans, if one has any, is actually worth something these days to collectors. Still have a few cans of Quaker State Deluxe 10w-40 SD oil in the fiber sided cans, which unfortunately have begun to seep slightly. Not sure what I'll do with it. Old oil in the full metal cans would be ice to have in limited quantities.