The process for any POL products (petroleum, oils, lubricants) for use in Aviation is set at much "higher bar" The quality, standards, definition of what is compatible or, "equal to or better" is black and white. That is one thing I personally like, I have, AN standards, Mil Spec, NAS ( National Aerospace Standards) , and SAE where applicable. Yeah, more binders and paperwork, but i can allways find an answer, well 99% of the time. I had to call Rolls & Royce about an armored car one time. Oh well good luck.