What are the standards used or methods for identifying when an oil may not be what it claims to be? Case in point would be Triax. Amazon reviews are great, lots of seller self-glorification, no API cert but a nice long list of manufacturer's specs it meets, but not endorsed by. I saw another thread here were someone quite pointedly said that the "approvals" should read "None." Would this be the same case with AMSoil?, Liquimoly? Royal Purple's non-API line? How do you conclude that an oil is good or not?