PUP is inferior to M1 OW-40 FS. The API standard the PUP meets is not nearly as stringent as MB 229.5 or Porsche A40. The Stellantis spec is meaningless. It is nothing but a marketing deal between Stellantis and SOPUS. Guess what the original SRT oil was?
Stellantis does not require anyone to use PUP or any oil that meets their special specification. The only requirement is to use an oil that has an API seal, which the M1 in question absolutely has.
Nothing I said was incorrect. If you believe that it was, quote the specific language, and then offer your reasoning as to why I am incorrect. It may not “make sense” to you to use a “European Car Formula,” but that does not make me incorrect.
Here’s a handy tool from Lubrizol. This may help illuminate things a bit:
online.lubrizol.com