How to flush engine that has milked the oil (headgasket) Cat 262B

Hi everyone just working on a 262B that has a blown head gasket. Any thoughts on restoring the engine oil back to normal other than just flushing with fresh oil. Eng has about 7000hrs and I'm having the head checked/ rebuilt. Crankcase is a mess of goop. Had thought to do an oil sample to confirm bearings aren't on a road to rapid failure after doing a couple flushes at least.

Thanks!

Nathan

How to flush engine that has milked the oil (headgasket) Cat 262B