In 20 years of working on and resurrecting old car and truck and now tractor engines here is what I have found: Somebody parks an old whatever and it sits for a decade or two. The crud is already there and dries out somewhat and moisture gets in there and then you have freeze/thaw cycles that over time loosen stuff up. Now we get it and tinker with it and get it running and everything warms up and next thing crud is sliding out from everywhere and the oil gets blamed. Really it wouldn't have mattered what oil you put in there.
If the people who blame the oil for loosening up the crud would just stop and think about what they are saying. I mean if that detergent really was that powerful of a contact cleaning agent then we wouldn't have to waste money on varsol or mineral spirits and instead we could clean parts with motor oil! No engine made since detergent oil would have a chance at getting sludged up yet we still find sludged up engines in cars less than 10 years old because people don't change the oil.
That said, I did have one plug a filter after a short time. Back in the 90's when I was a lot poorer we bought a used 350 out of a wrecked camaro to put in one of my camaros. This poor thing has lived in town all it's life and was really dirty inside. I mean crud wrapped around the pushrods and everything. We cleaned up under the valve covers while replacing gaskets and after replacing oil and filter got it in and running. I drove it a half mile down the road for a test, turned around and on the way back watched the oil pressure steadily dropping toward zero! It had completely plugged the oil filter in about 10 minutes of run time! IIRC we dropped the oil pan and cleaned out crud there and cleaned the oil pickup screen. I never blamed the oil, the problem was that it was just really dirty inside. After that it was ok. I used it for a year or two and after it was pulled out and torn down it was still really dirty inside!
Whenever I have brought a tractor home that's a runner, I always drop the pan as part of an overall PM strategy, regardless of what the tractor looks like, before I make it do any work.
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Today's Featured Article - Pitfalls of Tractor Engine Rebuilds - by Chris Pratt. The first pop after you have put the machine together with your own hands is exciting and pleasing. The whole experience can be marred if one moves too fast and makes too many assumptions that they can just use "as is" some parts they should be closely scrutinizing and possibly attended to. In such cases, rework makes what could have been a fun project turn into an irritant or even a nightmare. Minor Irritants To give you an example of an minor but irritating proble
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