Id be concerned about the transmission gears getting the right treatment, so I would drain out the oil and put in the proper oil.
I would not get very concerned at all about minor residues left in the tranny. That wont be a bother.
But I would worry about having the right additives in the gears. Motor oil might not treat them well long term.
Also in my climate going from below zero to over 100f any given year, I would worry about having the right consistency oil for the machine all year around. Too thin or too thick can be an issue.
If it were only the hydraulic system, I would be inclined to just leave it and see how it worked, be good enough. But with the transmission involved that is a whole different thing?
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Today's Featured Article - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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