Am not saying that either. I am saying there are no standards which require a synthetically manufactured oil to be any different from any other oil if it is to be sold as synthetic.
It is quite possible to make a superior oil but there is no requirement to do so. So it is wrong to assume a superior oil was made just because processes the marketing profession allows to be called "synthetic" were used.
"Synthetic" is a marketing term, not a performance specification. It comes out of the same place that prevents a YZ450F from being sold as a sport-tourer.
Some synthetic oils might be useable at 350°F but there is no requirement of all oil sold as synthetic to be useable at 350°F.
"Synthetic" is about as meaningless as a motor oil performance specification as the color of the bottle it came out of. Generally Amsoil is a superior motor oil but this is only because it is Amsoil's reputation at stake, not because it says "synthetic".