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 - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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