Shaeffers is the original moly bible folks, so ram forum has a lot of respect for the brand and their educating people on the benefits of moly. I find it weird they promote a long interval, I thought they were on the low end on starting tbn, which is the number one gauge of if an oil will combat acid, which is the mark all labs use to determine an interval. Some super genius will say yeah burla it isnt a linear relationship, which I didnt say it was, just that all we know is high tbn = long interval. It is a risk to betray that common sense, but long term uoa's do look ok with shaeffers.
I'd say Shaeffers has to be a top 5 choice for a hemi, if you don't consider interval.
Here is their pdf, you see their tbn is 7.0-7.5, which in nearly every other oil would be a conventional oil, most synthetics are in the 9's. So the point is, shaeffers is a great oil on a shorter interval. If you want learn other top choices, read the oil poll threads. Top 4 oils in order are Pennzoil-M1-Amsoil-Redline.