I guess SOP in that situation is to pull the heads and check for ring wear and blown head gaskets. I'm not familiar with the Command engines but I remember reading somewhere once about a valve that can clog and cause oil to go into the cylinders through the carburetor or something like that. Maybe someone more experienced with these engines can chime in. But with that many hours on it you may want to pull the heads and remove some of the carbon deposits, check the valves and put in a fresh set of head gaskets anyway.
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