Syn, you've got me confused. You're not willing to use Castrol 0/40 in you're 5.7 because of no moly or zinc, but if you get a 6.4 it would be one of you're top 3 choices. Other that bore and stroke they're basically the same engine aren't they, or does the 6.4 not have MDS?
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I have used The Belgium made Edge 0W-40 in my 5.7L along with 2 qts of the Belgium made Edge 0W-30 aka German Castrol. That was maybe 316 pages back! Maybe 400 I have no idea!
These 2 oils have a specific application in mind. Already discussed that! The viscosity of these 2 oils are different then others! These 2 oils refuse to shear.
My 5.7L only tows one or two times a year! I have no need for the extremely strong film strength from these oils.
My 5.7L really felt sluggish! It reacts totally different with the SRT 0W-40. Thus the reason I switched!
Mind U my 5.7L had no problems with the MDS the engine only felt slow to rev & I honestly fell victim to my old brain absorbing all the Bull$hit being spread about thick oil! LoL
If we do chose to bring home a 6.4L instead of a 6.7L CTD my 3 oils of choice will be
1. RL 10W-30
2. (Belgium) Castrol Edge 0W-40
3. PP Euro 0W-40
I even considered Shell Rotella T6 5W-40. It seems Shell has changed the formulation to appease the EPA. No Thanks! The VOA I witnessed was flat out embarrassing!
I honestly feel this motor put in this situation will shear the living $hit out of the SRT oil as well as the M1 Euro 0W-40. ( within a very short time)
This 6.4L will be exposed too some serious towing thus the reason for these oils.
Once again: Please don't concern yourself with what oil brand or viscosity or filters that I choose to use I'm not here looking for anybody's approval.
I do respect your curiosity and concern!
I'm not your normal owner...
I Pride myself on being totally different & I beat to a totally different drum than anybody else.