I would say that the best I have saved is Castrol Edge 5w30. But I also have some AC Delco and Amazon waiting also.
Sold it many years ago to get something easier to get thru college. That was a bad decision. About the same time my mom sold my 67 gto 46 k miles while i was out of town. She signed my name on the title. Along with a couple grand of tools and a gold watch and ring from my grandfather. I was not happy.Speaking of collectable, what happed to the SD 455?
Mine is depleting and there have been no clearance sales in a very long timeSL, but most is sn or sn+. My little hoard is my my only “win” against inflation.