Can't say as I've seen tractor vet post in a while, so not sure if he'll weigh in on this, but his missives/diatribes/rants/advice on this specific subject is here on this forum dozens of times and easily located through the search feature.
Vet-recommended octane is 93 as marked on the pump at the gas station. None of this, "Manual says Research method and pump is an average so if this that and the other thing hold true, 87 octane pump gas is the same as 93 by the Research method."
Right or wrong, a few gallons of 93 is a heck of a lot cheaper than taking a chance on melting a piston and ending up with a costly engine rebuild.
You're spot on with the IH low ash oil.
One other thing I remember is that you need to set the timing with a quality timing light.
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