- Joined
- Apr 28, 2012
- Posts
- 23,443
- Reaction score
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- Ram Year
- 2010 Hemi Reg Cab 4x4
- Engine
- Hemi
Thanks guys, that's what I thought. I won't be running into any low temperatures before my next oil change, that's for sure. Burla, you say 10w-30 will run thinner at operating temps, I thought it was heavier. What am I missing?
The number before the W is the winter rating nothing more, redline uses thicker base oil package for 5w30. Many of us wonder why. cSt is easy to look up on any oil, that is the flow rate at 212f operating temp, 5w30 cSt is 11.9, 10w30 is 11.4. Interestingly as the oil gets hotter, the 5w30 still runs thicker as shown by hths. It levels out on NOACK, which means 5w30 is a very special formula to have that performance despite having vii's.
I would prefer to use 10w30, but my engine knocked/ticked on it but is silent on 5w30, we all believe that is hths viscosity that reveals the why to that one. Why I like 10w30 better, no vii's which means no meaningless junk rolling around engine as the burn off. However, the 5w30 is such a special formula it is built to last, the uoa's show no shear, which is amazing. No shear means vii's still in tact, simply amazing beyond comprehension to be honest, facts are facts 5w30 is hemi honey. Run either with confidence.