Have you looked under the oil cap and any place you can peek into the valve covers?
If it is sludged up top, good chance it's dirty down below too.
If it got that dirty in 20,000 miles something is wrong or he hasn't got the story straight. It would not have sludged up in 20,000 miles if the oil had not been changed since the new engine.
Any check engine codes? Running extremely rich, open thermostat, excess idling and short trips would have explained the very dirty oil. It would have also clogged the converters.
Chances are there was no new long block, and the oil has been neglected for a long time. I would leave the new oil in and watch it, change it again when it gets to looking dirty, see what happens.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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