Best oil for My Slant 6

Hey, use whatever you want. Hell I used Quaker State for umpteen years back in the '70's and'80's. Everyone said it was garbage and would sludge up my engine. But Quaker State sponsored my stock eliminator car. Never had a problem. But time and technology change, and I am not an expert, but Lake Speed is, so I will defer to him.
PS: I had a boss at one time. Whenever he tried to get someone to change the way they were doing something, and they said "that's the way we have always done it". He would reply "So you've been doing it wrong for X number of years, don't you think it is time to do it right"?
:rofl: