There is No comparison between between food and a man made product,like motor oil. You don't eat motor oil,you blend it from base stocks.
"dealers trying to make a buck"--------What about the major bucks big oil is making,and it's all certified too!........Doesn't it feel so much better when you're getting..... "officially robbed" by a certified robber!
Show me where the lack of any API "CERTS",has led to any legal,or quality issues with motor oil products.
As far as food, man raises, cares for, and feeds the animal, then kills it, and brings it to market. Ever eat beef in Mexico?
Here we go with proof, show me proof the non certified oil is better? Not sales propaganda, or bogus tests.