No.
An industry standard spec, not a manufacturer specific spec.
Obviously there are lots of different manufacturer specs, that is the problem, there needs to be an industry wide spec.
Instead of having to inspect a container to see what manufacturer spec the oil claims* to meet it should be just like, say, gear oil. There should be an independent licensing and certifying program so one goes in and picks up a jug of, for example, 10w-30 TM oil and one knows that is what is needed regardless of who made it.
*AFAIK nobody checks to see if a fluid indeed meets or exceeds a tractor manufacturers specifications. So if Smutty's Fine Oil and Sex Wax Purveyors say their oil meets Mahindeerbota's oil specs, who is to say it does or doesn't?