- Joined
- Apr 28, 2012
- Posts
- 23,266
- Reaction score
- 44,967
- Ram Year
- 2010 Hemi Reg Cab 4x4
- Engine
- Hemi
Makes you wonder why spec 0w40 for a hemi anyway, if we believe manu's actually do care about this you would have to think it is about oil companies making 0 winter rated oils their best effort oils. You see with Hemi395's latest uoa that 0w30 can have a higher viscosity at the end of an interval then 0w40's. So I really wonder why for the 6.4 they didn't spec a 5,10, or even 15w40 oil. What would be a better choice, 0w30 that has substantially less vii's then 0w40 and still ends up thicker at the end of the inetrval, or a 0w40 that's viscosity is all over the board? Between 0w40, 0w30, 5w30, 10w30, 5w40, 10w40, or 15w40, which would be the worse weight oil to lubricate a 6.4. I think one could actually make an argument 0w40 (just considering viscosity) is the worst choice of all of these options to lubricate a hemi.