Ram5.7Lhemi: If you look at the #s... There is not much difference now! Your Engine will not be able to tell any difference...
Now a few years ago... When Pennzoil produced just Ultra! There was a difference... Now with the Pure Plus... I as well as many feel there is not that much difference...
Without showing pages and pages of Data and logistics which I physically can't-->I feel just by researching the information put in front of me...Along with Many UOA... Your motor will achieve basically the same results with Pennzoil Platinum as will PUP... {Many others feel the same way}...
Here is a little conversation about this same question...
Confused between PP & PUP | Passenger Car Motor Oil (PCMO) - Gasoline Cars/Pickups/Vans/SUVs | Bob Is The Oil Guy
I will say-->If you can't find PUP locally I can assure you with Full Confidence that PP will Handle anything you can throw at it.... PP will preform as well as PUP... The only thing is PUP has a bit more Calcium for better cleaning ability... There is talk of PUP having a {Thinner Viscosity Base Oil} compared to PP...