I use Rotella T6, no issues and its what the dealer I bought from use.

 

Seriously doubt the dealer would use an unapproved oil on the ED, CTD yes.

 

I don't think we have any true oil experts here. Lots of opinions and personal preference.
I wouldn't call 5w40 more "robust" than 5W30, yet I doubt you'd notice any difference between the two in your warm climate.

Since neither oil is the manufacturer recommend oil, it really makes no difference.

Since you are deleting the emissions any diesel oil would work.

 

And that's pretty much what I figured. Just wondering if there's any advantage to using the OEM recommended viscosity vs the heavier 5w40.

 

I am considereing running T-6 bone stock. May wait an oil change or two before I do though.

 

If you can get a 5-30 diesel oil in your area run that. Even the over land big rigs are useing 5-30 in the modern engines.

 

If it matters to you one difference is Shell is a foreign company and Chevron is a US company.

 

I knew "someone" would throw a plug for the Delo!

Also, there is the Mobil Delvac 1 LE 5W30 from another "American" oil conglomerate.

 

Used Oil Analysis - Bob is the Oil Guy - Bob is the Oil Guy
All questions answered in the forums section.

 

We have been running Shell Rotella T6 5W-40 in both our test trucks for over 30,000 miles now and the oil analysis is coming back very good. We are recommending any good quality 5W-40 weight oil in the Ram at this point in time. We have reason to believe the lower weight spec oil is not doing the any favors to the bearing life on this engine. The viscosity properties of a 40 weight oil seem to give a little better boundary layer between bearings and journals.

The FCA spec oil has a limit of 0.8ppm ash (this is their qualifying parameter) and the Shell T6 meets all the other FCA specs, but the ash is 1.0ppm. This difference is minimal in the grand scheme of things.

 

GDE... I agree, I have seen bearing slipping in motorcycle engine due to trying to run thinnest oil possible for qtr mile pass..not for me, I prefer protection.

 

I only use an approved oil while under warranty. They will want oil receipts if the engine fails.

 

I like DELO, my dad used to use it in his big trucks after he gave up on Archer oil.

 

Thanks guys! Looks like I'll be stocking up on some Delo 400LE Synthetic 5W30 while its on sale locally @ $19.99 along with an additional $3/gal rebate my dad can get me through the company he drives for.

 

I'll echo what GDE said and offer my 50 thousand miles on the oil to their testing.

 

will it void warranty if I use the heavier oil GDE recommends?

 

Using an oil other than what is recommended by RAM won't void the warranty, however it would make it easier for FCA to deny the warranty claim in which case you'd have to get into a legal battle to make FCA prove the oil you used was the cause of the warranty claim.
https://www.consumer.ftc.gov/articles/0138-auto-warranties-routine-maintenance