Originally Posted by Loobit
I kinda want to try 0w-30 in a Hemi with MDS. I can readily buy the stuff at my shop haha. It should be fine since it may shear into a 5w-20, which is what these engines call for. I feel a bit more viscosity for high temperatures is necessary since the summers here in Arizona are brutal.
As brutal as the summers are, the temps inside your engine are nearly twice as bad, every single day it reaches operating temps. Oil does not even start to behave correctly at temps that would kill you in less than half an hour. I agree with Geeman, if you are concerned your engine "needs" additional protection, a 10W30 will be better suited than a 0W30.