So a 30 grade would have better HT HS properties right>?The winter rating is important for expected starting conditions. The difference in cranking and pumpability between a 5W and a 0W rating is apparent below -30 or so. Above that there is little to no difference, either one may be thicker or thinner. But as long as it can be pumped it will make it to needed engine areas.
Both are 30 grade oils however. HT/HS is a better indicator of protection at operating temperature.
So the answer to my question is 'No'.I have been reading up on using the 5w-30 weight on ih8mud, Overseas Toyota calls for 5w30 and a wide range of weights for the 5.7. In the states it calls for 0w-20 and people are assuming its for CAFE standards. My truck is often loaded up with gear and either bashing through dunes or climbing rocks so I was thinking of switching to a heavier weight oil since my truck would fall under severe use per the owners manual.
I assume a slightly thicker oil would be better for a higher mileage motor as well as often better protection
You're chasing a problem that doesn't exist.You are correct, I have no solid data other than losing half a qt at 3,500 miles. Is it safe to assume a heavier oil would not evap/burn off?
You are correct, I have no solid data other than losing half a qt at 3,500 miles. Is it safe to assume a heavier oil would not evap/burn off?