Well, the majority will probably disagree with me, but here is what I have done with all my "new" old tractors. This is "real life", been there, done that.
When I first get them home, I run them up to working temp and observe the oil pressure (of course, after I get them running!) Then I immediately drain the oil and change the filter. Fresh HD oil and 1 quart of Rislone. I then run 'em for a while, keeping a close watch on the oil pressure. after what might add up to 15-20 hours of "up to temp" time, I will then drain the oil again and replace the filter. There after, I do normal oil changes with filter and use HD oil. I also flush out the rad at that point as well. Gets fresh antifreeze, corrosion additive, and water.
I have NOT scattered any engines. I have NOT plugged any oil filters. and I DO end up with a fairly clean oil system. About the only complaint I have is that some of the seals do start to leak a bit where previously they didn't. I accept that, and the seals needed to be replaced anyway. Only reason they weren't leaking is because of old sludge. Doesn't always produce leaking seals, but if they were borderline, they leak after the Rislone enema.
Like I said, I am probably in the minority here, but this has been my experience. I guess with a tractor of unknown maintanence or history, I wouldn't necessarily change to HD oil and then go run the snot out of it. Although, if you watch your oil guage, you can determine if you are running into a problem or not regardless of how hard you are working it.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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