So HPL a non factor, Ponzi/pyramid marketed like a 'Tupperware', 'Herbalife', 'Amway', 'Mary Kay' and Amsoil.
I think the main question is "who sponsored/performed this test"? My money is on HPL! Might be a good idea to add Amsoil's superior AME SAE 10W30/SAE 30 to the list-I bet it beats HPL in a few categories, instead of using the weaker SSO.
You two couldn't be more wrong...
https://bobistheoilguy.com/forums/threads/a-trip-to-high-performance-lubricants.326541/
https://bobistheoilguy.com/forums/threads/when-big-dumb-and-slow-is-a-good-thing.329068/