What brand of oil is so subjective that its divisive.
The API SL rating is a hard number that is beyond this name brand poppycock. That American Petroleum Institute service life rating. Its several tests to see how the oil holds up under heat and pressure. So generally speaking any of the brands that these guys are so loyal too are good oils.

I have no faith in human perfectability. I think that human exertion will have no appreciable effect upon humanity. Man is now only more active - not more happy - nor more wise, than he was 6000 years ago. Edgar Allan Poe