Re: Mobil 1 oil vs. Pennzoil
It doesn't really matter on the brand. Chrysler and Mobil's contract fell apart when Chrysler filed for bankruptcy. The 6.1 can use 0w-40, 5,w40, and even 15w-50 if the customer complains about lifter noise in the summer months. You can also use almost any weight in-between. I've run 10w-30, 20w-50, and a couple others without any issues.
The 6.4 on the other hand needs 0w-40 or 5w-40 only because of the VVT setup.
While on the subject, the 5.7 needs to stick with 5w-20 for the VVT reason as well.
As far as brand, any good synthetic will do. Don't forget to use a good filter as well..Mopar, K&N, and Mobil1 just to name a few.
2015 Billet Silver
2012 300SRT, 2009 Jeep SRT, 2006 Charger SRT
Too many mods to list for each, so let's just say a lot was done over the years.