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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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