Originally Posted by alarmguy
The only standardized way to rank oils is by API Rating.
Anything else is opinion.
Oils of equal API are equal (and that includes conventional and semi)

)
Wrong. Just dead wrong. In a thread asking an essentially unanswerable question, you've found one "answer" that is actually, objectively incorrect. These two members already responded, very appropriately:
Originally Posted by Triple_Se7en
They are not equal. They only qualify for the specification. Afterwards, your vehcle decides the ranking. Non TGDIs will rank differently than TGDIs.
It all depends ohttps://bobistheoilguy.com/forums/ubbthreads.php/topics/5061547/rank-the-synthetic-oils#Post5061547n what you got under the hood - how often you change it - driving habits - location......etc.
Originally Posted by d00df00d
Originally Posted by alarmguy
The only standardized way to rank oils is by API Rating.
Anything else is opinion.
Oils of equal API are equal (and that includes conventional and semi)

)
Or ACEA rating.
Or any number of manufacturer's ratings.
I would also add that
even if you look only at the API certification, you can't really "rank" the oils that way, except to divide them into two groups -- the ones that meet a particular API category and those that don't. And within one API category, you could have one superb oil, and another that meets the spec just barely and performs poorly. But using API, you can't rank them; they're in the same API cat. And you can have oils of different viscosity, but the same API, and so on.
There is some benefit, though, in the subject answer: it highlights the utter hopelessness of this thread in the first place. There are simply too many differing situations, requirements and so forth to meaningfully "Rank the Synthetic Oils". Those who need the ultimate in high temperature durability WILL rank the same oils differently, for example, than those who are seeking long drain intervals for passenger cars or lowest cost for a fleet. And so on.