As far as Mobil 1 goes....I think 0w20 and 0w30 are great oils. I can't say that about their 5w20 or 5w30.
As far as PP goes....just don't know. I want to think that their 0w and 5w oils are very, very good, but don't know whether ow20 or their 5w20 is better.
Currently, we are running Mobil 1 0w20 in my daughter's T-Yaris and it loves it.
But, based upon Valvoline's challenges....I am loosing my faith in Mobil 1. I have 8 quarts of Pennzoil Platinum 5w30 ready to go in my vehicles....first time I have ever used PP.
If all goes well....it will be PP for me from this point forward....that is until my daughter's T-Yaris slips past its warranty...and then it is 12 month OCI's on Amsoil for us....and it will be 0W20.