someone should post the link for the oil charts,
This is a real interesting point, however all the oil charts are fragmented pieces of information. You have VOA's and UOA's that have general information, then individual testing that shows certain aspects like NOACK, or how much an oil will evap at a certain temp. All of the tests are useful, but they are only guides because the real true test is what an engine looks like when it is broken down after using an oil for 100k plus miles. And as big as oil choice is keeping the PCV in working order or no matter what oil you have your engine will suffer.
Charts are helpful but in the end it is all theory and common sense as opposed to good solid facts. Anyone who tells you different is trying to sell you something. The fact is most vehicles can do fine with just about any shelf oil. However, most vehicles don't have the lifters we have and are not forced to use such a thin oil in a v8. The real question we should be asking is, "why did Dodge choose 5w20?". I think they know they have major lifter issues using a thick oil, or one other possible answer is to bow down to CAFE standards and to get the best possible gas mileage, or a combo of both.
Anyhow, we as hemi drivers have to use common sense in oil choice because the data on massive tear downs on massive vehicles at high miles and brand religious consumers does not exist anywhere. You can find one guy who ran x miles on x oil and the tear down looked great, but that isn't a body of knowledge that helps us a lot. There is a body of knowledge out there on bases of oil and they are not tests that we commonly think but rather generalities. Generally group 3 is better then group 2, generally group 4/5 are better then group 3. The evidence is over whelming about these generalities, but oil grouping does not show up on any test.
You have to take the word of the manufacturer that they are group 4 or 5, or even 3 and you have to except that the higher the grouping the better the oil, and if you cannot accept that then you should just buy the cheapest thing on the shelf because currently there is no test that will show you different.