I run the UPF63R on our Cadillac since they’re called for by name in the manual. On my Silverado, I just run the standard PF63. When we bought the Caddy CPO, the dealer had a PF63 on it when I changed the oil. I wouldn’t think that GM would call for the UPF63R if it wasn’t needed??? There seems to be a TSB on them using the ultra.