I have a 2014 Hemi 5.7. MDS disabled and have used both AMSOIL Signature Series and Redline. 5W-30 for both. I honestly couldn't tell one from the other. The AMSOIL did fantastic job and the redline did to. The rest of this is JUST MY OPINION. I feel modern V8's need a stout oil to do the job required. You have VVT and fuel economy your trying to accomplish with a oil. I feel using a oil like AMSOIL and Redline protect the more complex modern V8. I personally use the AMSOIL from November-April due to how well it's cold pumpabilty is and I use the Redline May-October. Im not a triboligist or claim to have any proof but my whole goal is the same as every other person on this site, to get as many miles possible while keeping the engine to littlest engine wear possible. We all want our engines to have the same power it had the day it rolled off the line. I think the reason we all share what we do is because we take care of our engines. Not a bad thing. I also got over 400,000 miles out of my 96 Ford ranger 2.5 with strictly using Castrol High mileage and the basic Fram PH8A. Get a oil you like and use it and leave it. Life Is short and your not taking it with you.