Just change the oil with some heavy detergent oil and start changing the oil every 1k miles for a while. No point building an engine till it's really toast. If you're lucky, the critical areas will clean up and the motor will still last a long time.
Do it with some cheap penzoil for a couple of changes then go to good stuff when you see it stays clean longer.
look for:
"Helps prevent sludge and other damaging deposits
Helps clean up existing sludge in your engine
Provides proven wear protection"
in the description.
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