5w20 vs 5w30

[bigdodge]

I've read 50/50 decision on this matter with the 5.7 hemis what's your guys thoughts is 5w30 safe to run

follow owner's manual is the best bet.

 

[silver billet]

follow owner's manual is the best bet.

Owner's manual also says transmission fluid is "lifetime" and doesn't need to be serviced. They're very clearly wrong as ZF says to service it.

5w-30 offers superior protection, it's not a "oil cap" thing it's a tribology thing.

 

[Jkmrc51]

Olive oil is just fine as long as it’s Extra Virgin.

View attachment IMG_0002.webp

 

[mikeru82]

Oil cap says 5w20, so I run 0w20...

Meh...the cap on our 2020 Limited says 5w 20, so I run Redline 5w 30.
There are lots of arguments on which oil to run. This new thread is pointless with the information available out there. Older Hemi's called for 5w 30. Newer Hemi's call for 0w 20. At some point between they called for 5w 20. But nothing internal was changed as far as bearing clearances go. I believe they changed the recommended oil from 5w 30 to 5w 20 after adding MDS. I never let MDS engage so I'm confident running 5w 30. I also do 5k oil change intervals.

In the end my point is if you're worried about your warranty then you should stick with the recommended viscosity. Period, end of sentence. If you're less concerned about that (as in my case) then run what you feel is best for your engine.