I have been on this di issue a long time ago, most if not every guy here is like why is Burla keep bringing up di in the oil thread. I saw this coming more then a decade ago, what di's reveal and how every oil on the shelf has changed because of di's. The issue is oil manu's mostly addressed the CA di issue and the cleaning issue's, but left out stay in grade viscosities. When a guy puts a 5w30 in his engine, he expects it to be a 30 weight at 4k miles driving, and most of the time that is the case, not so with amsoil SS 5w30. Maybe it will if you have a well running engine, perhaps a low rpm 4 banger, gonna be easy on any oil. And maybe even in a ram, but you need a uoa to verify. But when you chose an oil because of a NAME and not a formula, you risk a result based on feelings and not facts. 5w30 is a moderate swing winter rating to weight, but it is still significant, and when you start at 10.3 operating viscosity, you are in a sense running a 20 weight oil, it is just a matter of time.
Now, if you are in deep appreciating with the name AMSOIL, I have put great options not the SS formula that have great starting viscosities, guys that 0w30 euro amsoil is the real deal. Europe has largely ditched or adjusted to those dumb oil policies as far as formulas go. Amsoil chose to embrace API goals more so with 5w30 SS then any other of their formulas, been saying this since I saw it. The day they made the new SS they were no longer in competition with redline where they had been since redline first started. It was no longer what tradition called a boutique. Went away from calling themselves group 4 and went to API formulas that don't even resemble boutique oils. Their formulas were made for di's where redline's didn't even try for the di market. Who's smarter? Amsoil for sure, it was not smart redline could make a killer di oil if they tried. But for a hemi, who cares about di? Well you do if you are running a di friendly API oil it was made for a di and you are choosing to believe this "universal" formula is also perfect for hemi's, which is perfectly fine who am I to judge. Where amsoil still nails it is for the long interval, if you ignore the fact the viscosity isn't stable and no big deal it shears to a 20 weight, then it still is one of the best oils for a long interval, much better then redline for that.
I'm on vacation so I can ponder 100,000 rpm turbo spinning.