i was going to suggest inspecting the flter but wasnt sure he would want to do that. also after running a fresh engine for the first time there can be other wear particles in the oil/filter that could be misleading. i use a strong magnetic drain plug that will show any magnetic metals easier than cutting open a filter.
besides finding it early on in a filter or magnetic plug, after a short time you will usually hear a slight tick start that adjusting will only stop for a short time then it comes back.
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