Sounds like a bunch of techno-babble to me. Seems to contradict itself, but not committing to a specific outcome. When oil is used mostly for lubrication, I can see that it would become contaminated with residue from the friction of the moving parts. In an engine, there is always some blow by that contaminates the oil. BUT....at the same time, back in the '70s, I recall a number of "old timers" insisted that re-refined oil was the best thing to use because it had already had the paraffin burned out of it. There was no talk of oil breakdown. I would think that oil used in a hydraulic system would last a long time, and would eventually become contaminated with material from the pump or cylinders it operates. I would think that things like residue from combustion, wear from moving parts, and heat would be the determining factors in deciding when oil should be changed. Keep in mind that not everything you read on the 'net is factual or truth. The oil producers have a vested interest in selling you more oil. The equipment makers have a vested interest in making your equipment last longer (but not TOO long ). These days, it seems that everybody has an agenda.
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Today's Featured Article - Restoration Story: 1929 McCormick-Deering 10-20 - by Randal Simmon. On July 4th 1998 my dad and I was sitting on the front porch when he said that he was going to sell his two 10-20's to a junk man. He said that the junk man was going to give him $500 for both of them but he hadn't received the money for them yet. So I went into the house and wrote him a check for $500 and bought them myself and said now they are mine. He had bought them about five years before thinking that he was going to restore them himself. After five years sitting in the barn, he changed h
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