Which Oil Grade do I Need?
My 2013 Ram 2500 Hemi has "5w20" stamped on the oil filler cap. However, the owners manual says to run "5w30" with a gross weight of 14,000 pounds. Well, the truck weighs about 6200 and the TT weighs ...
Forum Discussion
Charlie D. wrote:JustLabs wrote:
I'd use a 5w-20.
The 5w-30 will probably shear out of grade and end up as a 5w-20 anyways.
With that logic wouldn't the 5w-20 shear also and lower the viscosity?
There is no logic with those types of statements, nor facts. This statement then assumes a Xw-20 will sheer to a Xw-10!
Anyone who keeps up with UOA's (used oil analysis) reports on the web knows AND does their very own...knows very few motor oils sheer out of grade in automotive engine applications.
There is also a lot of variation of virgin oils, where 5w-20's are actually within 5w-30 viscosity range. This means nothing except to tell us how close the numbers really are!
