Good reading thanks.
I mistakenly thought strieght 30wt was the same as 0W 30.
One red flag is he never mentions the difference between N.E. crude
oil and S.W crude
oil. Never use NE oils as they are parifin based and cook down to a waxy gunk on your cylinder heads. (especially Quacker state and Pensoil) Texas crude is asphalt based and does not do this.
Synthetic is the way to go... I'd been advised a long time ago to stay away from the higher weights by engine builders I know.