I should add the in our 7.3’s (we have 4 of them) I run our CK-4 5w40 with our climate. It also does not shear. Thinner oil does not bother these engines so a 10w30 is also a good option.
this is why my personal vehicles and our fleet will be moving to HPL. dave could EASILY sell you a more expensive oil and enjoy making a few extra $$$. he actually takes into account what you do, what you drive and gives you an honest answer. no foreign call center or stripped down PDS’ to look at. they share all specs and it’s available to joe blow aswell as their competitors.