What is any of that supposed to mean?
I have no doubt that there have been failures using synthetic, conventional, or blends. “No failures” is not a reasonable standard as you have no idea what really caused the failure. A better question or standard is: Does a given oil reduce failure rates, increase up time, minimize wear, etc?
Are you trying to imply that data sheets, specs, or info published by manufacturers online is less reputable than through some other source?
I’ve been watching my gear boxes (especially the transmission) closely and pull the fill plugs from time to time and check the chips on the magnets. Have any of you done this periodically and kept notes?
My transmission had oil\water muck in it when I got it with lots of metal chips. The side plate for PTO has a pitted rust line on the lower ½ or so and there was rust here and there all over. My hunch is that the truck was ran through a river or flooding without getting the fluids drained… I did 3 flushes and cleanings with conventional 80-90W before the chip level seemed to level off and nearly stop. I’m running synthetic blend and pulled the fill plug a couple days ago to find few if any new chips in a few hundred mile period. Will keep an eye on it.
Others have seen failures in the trans with synthetic.
Do your homework before you put your faith in what you read on the internet.